mirror of
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220cbc840a
This for consistency, I suspect inserting a value into the special operations type enumeration will cause external programs some backwards compatibility issues. We should consider reverting this and adding the new value to the end.
588 lines
25 KiB
C++
588 lines
25 KiB
C++
#ifndef NETWORK_MESSAGE_HPP__
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#define NETWORK_MESSAGE_HPP__
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/*
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* WSJT-X Message Formats
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* ======================
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*
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* All messages are written or read using the QDataStream derivatives
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* defined below, note that we are using the default for floating
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* point precision which means all are double precision i.e. 64-bit
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* IEEE format.
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*
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* Message is big endian format
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*
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* Header format:
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*
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* 32-bit unsigned integer magic number 0xadbccbda
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* 32-bit unsigned integer schema number
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*
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* Payload format:
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*
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* As per the QDataStream format, see below for version used and
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* here:
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*
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* http://doc.qt.io/qt-5/datastreamformat.html
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*
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* for the serialization details for each type, at the time of
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* writing the above document is for Qt_5_0 format which is buggy
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* so we use Qt_5_4 format, differences are:
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*
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* QDateTime:
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* QDate qint64 Julian day number
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* QTime quint32 Milli-seconds since midnight
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* timespec quint8 0=local, 1=UTC, 2=Offset from UTC
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* (seconds)
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* 3=time zone
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* offset qint32 only present if timespec=2
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* timezone several-fields only present if timespec=3
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*
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* we will avoid using QDateTime fields with time zones for
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* simplicity.
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*
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* Type utf8 is a utf-8 byte string formatted as a QByteArray for
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* serialization purposes (currently a quint32 size followed by size
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* bytes, no terminator is present or counted).
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*
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* The QDataStream format document linked above is not complete for
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* the QByteArray serialization format, it is similar to the QString
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* serialization format in that it differentiates between empty
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* strings and null strings. Empty strings have a length of zero
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* whereas null strings have a length field of 0xffffffff.
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*
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*
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* Schema Negotiation
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* ------------------
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*
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* The NetworkMessage::Builder class specifies a schema number which
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* may be incremented from time to time. It represents a version of
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* the underlying encoding schemes used to store data items. Since the
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* underlying encoding is defined by the Qt project in it's
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* QDataStream stream operators, it is essential that clients and
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* servers of this protocol can agree on a common scheme. The
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* NetworkMessage utility classes below exchange the schema number
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* actually used. The handling of the schema is backwards compatible
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* to an extent, so long as clients and servers are written
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* correctly. For example a server written to any particular schema
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* version can communicate with a client written to a later schema.
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*
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* Schema Version 1:- this schema used the QDataStream::Qt_5_0 version
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* which is broken.
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*
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* Schema Version 2:- this schema uses the QDataStream::Qt_5_2 version.
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*
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* Schema Version 3:- this schema uses the QDataStream::Qt_5_4 version.
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*
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*
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* Backward Compatibility
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* ----------------------
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*
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* It is important that applications developed at different times
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* remain compatible with this protocol and with older or newer
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* versions of WSJT-X. This is achieved by both third-party
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* applications and WSJT-X honouring two basic rules.
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*
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* 1. New message types may be added to the protocol in the future,
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* third-party applications and WSJT-X shall ignore silently any
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* message types they do not recognize.
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*
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* 2. New fields may be added to existing message types, they will
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* always be added to the end of the existing fields and the number
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* and type of existing fields shall not change. If a field type
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* must be changed; a new field will be added and the existing
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* field will remain. The originator of such a message shall
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* populate both the new and old field with reasonable
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* values. Third-party applications and WSJT-X shall ignore
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* silently any extra data received in datagrams after the fields
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* they know about.
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*
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* Note that these rules are unrelated to the schema number above
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* whose purpose is to distinguish between non-compatible encodings of
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* field data types. New message types and extra fields in existing
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* messages can and will be added without any change in schema number.
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*
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*
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* Message Types
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* -------------
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*
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* Message Direction Value Type
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* ------------- --------- ---------------------- -----------
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* Heartbeat Out/In 0 quint32
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* Id (unique key) utf8
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* Maximum schema number quint32
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* version utf8
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* revision utf8
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*
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* The heartbeat message shall be sent on a periodic basis every
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* NetworkMessage::pulse seconds (see below), the WSJT-X
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* application does that using the MessageClient class. This
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* message is intended to be used by servers to detect the presence
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* of a client and also the unexpected disappearance of a client
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* and by clients to learn the schema negotiated by the server
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* after it receives the initial heartbeat message from a client.
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* The message_aggregator reference server does just that using the
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* MessageServer class. Upon initial startup a client must send a
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* heartbeat message as soon as is practical, this message is used
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* to negotiate the maximum schema number common to the client and
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* server. Note that the server may not be able to support the
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* client's requested maximum schema number, in which case the
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* first message received from the server will specify a lower
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* schema number (never a higher one as that is not allowed). If a
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* server replies with a lower schema number then no higher than
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* that number shall be used for all further outgoing messages from
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* either clients or the server itself.
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*
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* Note: the "Maximum schema number" field was introduced at the
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* same time as schema 3, therefore servers and clients must assume
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* schema 2 is the highest schema number supported if the Heartbeat
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* message does not contain the "Maximum schema number" field.
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*
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*
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* Status Out 1 quint32
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* Id (unique key) utf8
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* Dial Frequency (Hz) quint64
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* Mode utf8
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* DX call utf8
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* Report utf8
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* Tx Mode utf8
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* Tx Enabled bool
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* Transmitting bool
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* Decoding bool
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* Rx DF quint32
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* Tx DF quint32
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* DE call utf8
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* DE grid utf8
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* DX grid utf8
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* Tx Watchdog bool
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* Sub-mode utf8
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* Fast mode bool
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* Special Operation Mode quint8
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* Frequency Tolerance quint32
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* T/R Period quint32
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* Configuration Name utf8
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*
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* WSJT-X sends this status message when various internal state
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* changes to allow the server to track the relevant state of each
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* client without the need for polling commands. The current state
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* changes that generate status messages are:
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*
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* Application start up,
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* "Enable Tx" button status changes,
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* dial frequency changes,
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* changes to the "DX Call" field,
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* operating mode, sub-mode or fast mode changes,
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* transmit mode changed (in dual JT9+JT65 mode),
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* changes to the "Rpt" spinner,
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* after an old decodes replay sequence (see Replay below),
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* when switching between Tx and Rx mode,
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* at the start and end of decoding,
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* when the Rx DF changes,
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* when the Tx DF changes,
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* when settings are exited,
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* when the DX call or grid changes,
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* when the Tx watchdog is set or reset,
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* when the frequency tolerance is changed,
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* when the T/R period is changed,
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* when the configuration name changes.
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*
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* The Special operation mode is an enumeration that indicates the
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* setting selected in the WSJT-X "Settings->Advanced->Special
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* operating activity" panel. The values are as follows:
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*
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* 0 -> NONE
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* 1 -> NA VHF
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* 2 -> EU VHF
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* 3 -> FIELD DAY
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* 4 -> RTTY RU
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* 5 -> WW DIGI
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* 6 -> FOX
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* 7 -> HOUND
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*
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* The Frequency Tolerance and T/R period fields may have a value
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* of the maximum quint32 value which implies the field is not
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* applicable.
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*
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*
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* Decode Out 2 quint32
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* Id (unique key) utf8
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* New bool
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* Time QTime
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* snr qint32
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* Delta time (S) float (serialized as double)
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* Delta frequency (Hz) quint32
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* Mode utf8
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* Message utf8
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* Low confidence bool
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* Off air bool
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*
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* The decode message is sent when a new decode is completed, in
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* this case the 'New' field is true. It is also used in response
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* to a "Replay" message where each old decode in the "Band
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* activity" window, that has not been erased, is sent in order
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* as a one of these messages with the 'New' field set to false.
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* See the "Replay" message below for details of usage. Low
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* confidence decodes are flagged in protocols where the decoder
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* has knows that a decode has a higher than normal probability
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* of being false, they should not be reported on publicly
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* accessible services without some attached warning or further
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* validation. Off air decodes are those that result from playing
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* back a .WAV file.
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*
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*
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* Clear Out/In 3 quint32
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* Id (unique key) utf8
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* Window quint8 (In only)
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*
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* This message is send when all prior "Decode" messages in the
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* "Band Activity" window have been discarded and therefore are
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* no long available for actioning with a "Reply" message. It is
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* sent when the user erases the "Band activity" window and when
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* WSJT-X closes down normally. The server should discard all
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* decode messages upon receipt of this message.
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*
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* It may also be sent to a WSJT-X instance in which case it
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* clears one or both of the "Band Activity" and "Rx Frequency"
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* windows. The Window argument can be one of the following
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* values:
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*
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* 0 - clear the "Band Activity" window (default)
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* 1 - clear the "Rx Frequency" window
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* 2 - clear both "Band Activity" and "Rx Frequency" windows
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*
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*
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* Reply In 4 quint32
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* Id (target unique key) utf8
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* Time QTime
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* snr qint32
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* Delta time (S) float (serialized as double)
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* Delta frequency (Hz) quint32
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* Mode utf8
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* Message utf8
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* Low confidence bool
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* Modifiers quint8
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*
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* In order for a server to provide a useful cooperative service
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* to WSJT-X it is possible for it to initiate a QSO by sending
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* this message to a client. WSJT-X filters this message and only
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* acts upon it if the message exactly describes a prior decode
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* and that decode is a CQ or QRZ message. The action taken is
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* exactly equivalent to the user double clicking the message in
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* the "Band activity" window. The intent of this message is for
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* servers to be able to provide an advanced look up of potential
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* QSO partners, for example determining if they have been worked
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* before or if working them may advance some objective like
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* award progress. The intention is not to provide a secondary
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* user interface for WSJT-X, it is expected that after QSO
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* initiation the rest of the QSO is carried out manually using
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* the normal WSJT-X user interface.
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*
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* The Modifiers field allows the equivalent of keyboard
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* modifiers to be sent "as if" those modifier keys where pressed
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* while double-clicking the specified decoded message. The
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* modifier values (hexadecimal) are as follows:
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*
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* no modifier 0x00
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* SHIFT 0x02
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* CTRL 0x04 CMD on Mac
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* ALT 0x08
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* META 0x10 Windows key on MS Windows
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* KEYPAD 0x20 Keypad or arrows
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* Group switch 0x40 X11 only
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*
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*
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* QSO Logged Out 5 quint32
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* Id (unique key) utf8
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* Date & Time Off QDateTime
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* DX call utf8
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* DX grid utf8
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* Tx frequency (Hz) quint64
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* Mode utf8
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* Report sent utf8
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* Report received utf8
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* Tx power utf8
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* Comments utf8
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* Name utf8
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* Date & Time On QDateTime
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* Operator call utf8
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* My call utf8
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* My grid utf8
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* Exchange sent utf8
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* Exchange received utf8
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*
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* The QSO logged message is sent to the server(s) when the
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* WSJT-X user accepts the "Log QSO" dialog by clicking the "OK"
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* button.
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*
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*
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* Close Out/In 6 quint32
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* Id (unique key) utf8
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*
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* Close is sent by a client immediately prior to it shutting
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* down gracefully. When sent by a server it requests the target
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* client to close down gracefully.
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*
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*
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* Replay In 7 quint32
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* Id (unique key) utf8
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*
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* When a server starts it may be useful for it to determine the
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* state of preexisting clients. Sending this message to each
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* client as it is discovered will cause that client (WSJT-X) to
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* send a "Decode" message for each decode currently in its "Band
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* activity" window. Each "Decode" message sent will have the
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* "New" flag set to false so that they can be distinguished from
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* new decodes. After all the old decodes have been broadcast a
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* "Status" message is also broadcast. If the server wishes to
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* determine the status of a newly discovered client; this
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* message should be used.
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*
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*
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* Halt Tx In 8
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* Id (unique key) utf8
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* Auto Tx Only bool
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*
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* The server may stop a client from transmitting messages either
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* immediately or at the end of the current transmission period
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* using this message.
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*
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*
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* Free Text In 9
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* Id (unique key) utf8
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* Text utf8
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* Send bool
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*
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* This message allows the server to set the current free text
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* message content. Sending this message with a non-empty "Text"
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* field is equivalent to typing a new message (old contents are
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* discarded) in to the WSJT-X free text message field or "Tx5"
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* field (both are updated) and if the "Send" flag is set then
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* clicking the "Now" radio button for the "Tx5" field if tab one
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* is current or clicking the "Free msg" radio button if tab two
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* is current.
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*
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* It is the responsibility of the sender to limit the length of
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* the message text and to limit it to legal message
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* characters. Despite this, it may be difficult for the sender
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* to determine the maximum message length without reimplementing
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* the complete message encoding protocol. Because of this is may
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* be better to allow any reasonable message length and to let
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* the WSJT-X application encode and possibly truncate the actual
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* on-air message.
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*
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* If the message text is empty the meaning of the message is
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* refined to send the current free text unchanged when the
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* "Send" flag is set or to clear the current free text when the
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* "Send" flag is unset. Note that this API does not include a
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* command to determine the contents of the current free text
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* message.
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*
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*
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* WSPRDecode Out 10 quint32
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* Id (unique key) utf8
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* New bool
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* Time QTime
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* snr qint32
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* Delta time (S) float (serialized as double)
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* Frequency (Hz) quint64
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* Drift (Hz) qint32
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* Callsign utf8
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* Grid utf8
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* Power (dBm) qint32
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* Off air bool
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*
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* The decode message is sent when a new decode is completed, in
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* this case the 'New' field is true. It is also used in response
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* to a "Replay" message where each old decode in the "Band
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* activity" window, that has not been erased, is sent in order
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* as a one of these messages with the 'New' field set to
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* false. See the "Replay" message below for details of
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* usage. The off air field indicates that the decode was decoded
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* from a played back recording.
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*
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*
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* Location In 11
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* Id (unique key) utf8
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* Location utf8
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*
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* This message allows the server to set the current current
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* geographical location of operation. The supplied location is
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* not persistent but is used as a session lifetime replacement
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* loction that overrides the Maidenhead grid locater set in the
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* application settings. The intent is to allow an external
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* application to update the operating location dynamically
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* during a mobile period of operation.
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*
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* Currently only Maidenhead grid squares or sub-squares are
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* accepted, i.e. 4- or 6-digit locators. Other formats may be
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* accepted in future.
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*
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*
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* Logged ADIF Out 12 quint32
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* Id (unique key) utf8
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* ADIF text utf8
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*
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* The logged ADIF message is sent to the server(s) when the
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* WSJT-X user accepts the "Log QSO" dialog by clicking the "OK"
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* button. The "ADIF text" field consists of a valid ADIF file
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* such that the WSJT-X UDP header information is encapsulated
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* into a valid ADIF header. E.g.:
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*
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* <magic-number><schema-number><type><id><32-bit-count> # binary encoded fields
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* # the remainder is the contents of the ADIF text field
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* <adif_ver:5>3.0.7
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* <programid:6>WSJT-X
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* <EOH>
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* ADIF log data fields ...<EOR>
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*
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* Note that receiving applications can treat the whole message
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* as a valid ADIF file with one record without special parsing.
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*
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*
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* Highlight Callsign In 13 quint32
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* Id (unique key) utf8
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* Callsign utf8
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* Background Color QColor
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* Foreground Color QColor
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* Highlight last bool
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*
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* The server may send this message at any time. The message
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* specifies the background and foreground color that will be
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* used to highlight the specified callsign in the decoded
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* messages printed in the Band Activity panel. The WSJT-X
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* clients maintain a list of such instructions and apply them to
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* all decoded messages in the band activity window. To clear
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* and cancel highlighting send an invalid QColor value for
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* either or both of the background and foreground fields. When
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* using this mode the total number of callsign highlighting
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* requests should be limited otherwise the performance of WSJT-X
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* decoding may be impacted. A rough rule of thumb might be too
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* limit the number of active highlighting requests to no more
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* than 100.
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*
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* The "Highlight last" field allows the sender to request that
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* all instances of "Callsign" in the last period only, instead
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* of all instances in all periods, be highlighted.
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*
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*
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* SwitchConfiguration In 14 quint32
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* Id (unique key) utf8
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* Configuration Name utf8
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*
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* The server may send this message at any time. The message
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* specifies the name of the configuration to switch to. The new
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* configuration must exist.
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*
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*
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* Configure In 15 quint32
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* Id (unique key) utf8
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* Mode utf8
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* Frequency Tolerance quint32
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* Submode utf8
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* Fast Mode bool
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* T/R Period quint32
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* Rx DF quint32
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* DX Call utf8
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* DX Grid utf8
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* Generate Messages bool
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*
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* The server may send this message at any time. The message
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* specifies various configuration options. For utf8 string
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* fields an empty value implies no change, for the quint32 Rx DF
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* and Frequency Tolerance fields the maximum quint32 value
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* implies no change. Invalid or unrecognized values will be
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* silently ignored.
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*/
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#include <QDataStream>
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#include "pimpl_h.hpp"
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class QIODevice;
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class QByteArray;
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class QString;
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namespace NetworkMessage
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{
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// NEVER DELETE MESSAGE TYPES
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enum Type
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{
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Heartbeat,
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Status,
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Decode,
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Clear,
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Reply,
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QSOLogged,
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Close,
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Replay,
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HaltTx,
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FreeText,
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WSPRDecode,
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Location,
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LoggedADIF,
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HighlightCallsign,
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SwitchConfiguration,
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Configure,
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maximum_message_type_ // ONLY add new message types
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// immediately before here
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};
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quint32 constexpr pulse {15}; // seconds
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//
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// NetworkMessage::Builder - build a message containing serialized Qt types
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//
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class Builder
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: public QDataStream
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{
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public:
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static quint32 constexpr magic {0xadbccbda}; // never change this
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// increment this if a newer Qt schema is required and add decode
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// logic to the Builder and Reader class implementations
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#if QT_VERSION >= 0x050400
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static quint32 constexpr schema_number {3};
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#elif QT_VERSION >= 0x050200
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static quint32 constexpr schema_number {2};
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#else
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// Schema 1 (Qt_5_0) is broken
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#error "Qt version 5.2 or greater required"
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#endif
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explicit Builder (QIODevice *, Type, QString const& id, quint32 schema);
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explicit Builder (QByteArray *, Type, QString const& id, quint32 schema);
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Builder (Builder const&) = delete;
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Builder& operator = (Builder const&) = delete;
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private:
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void common_initialization (Type type, QString const& id, quint32 schema);
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};
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//
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// NetworkMessage::Reader - read a message containing serialized Qt types
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//
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// Message is as per NetworkMessage::Builder above, the schema()
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// member may be used to determine the schema of the original
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// message.
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//
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class Reader
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: public QDataStream
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{
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public:
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explicit Reader (QIODevice *);
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explicit Reader (QByteArray const&);
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Reader (Reader const&) = delete;
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Reader& operator = (Reader const&) = delete;
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~Reader ();
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quint32 schema () const;
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Type type () const;
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QString id () const;
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private:
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class impl;
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pimpl<impl> m_;
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};
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}
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#endif
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