Add maximum peer limit for master instances

hb_config.py

@@ -202,6 +202,7 @@ def build_config(_config_file):
                         'MODE': config.get(section, 'MODE'),
                         'ENABLED': config.getboolean(section, 'ENABLED'),
                         'REPEAT': config.getboolean(section, 'REPEAT'),
+                        'MAX_PEERS': config.getint(section, 'MAX_PEERS'),
                         'EXPORT_AMBE': config.getboolean(section, 'EXPORT_AMBE'),
                         'IP': gethostbyname(config.get(section, 'IP')),
                         'PORT': config.getint(section, 'PORT'),

hblink-SAMPLE.cfg

@@ -142,12 +142,17 @@ TGID_ACL: PERMIT:ALL
 # and unused by anything else.
 # Repeat - if True, the master repeats traffic to peers, False, it does nothing.
 #
+# MAX_PEERS -- maximun number of peers that may be connect to this master
+# at any given time. This is very handy if you're allowing hotspots to
+# connect, or using a limited computer like a Raspberry Pi.
+#
 # ACLs:
 # See comments in the GLOBAL stanza
 [MASTER-1]
 MODE: MASTER
 ENABLED: True
 REPEAT: True
+MAX_PEERS: 10
 EXPORT_AMBE: False
 IP:
 PORT: 54000

hblink.py

@@ -370,6 +370,8 @@ class HBSYSTEM(DatagramProtocol):
 
         elif _command == 'RPTL':    # RPTLogin -- a repeater wants to login
             _peer_id = _data[4:8]
+            # Check to see if we've reached the maximum number of allowed peers
+            if len(self._peers < self._config['MAX_PEERS']):
                 # Check for valid Radio ID
                 if acl_check(_peer_id, self._CONFIG['GLOBAL']['REG_ACL']) and acl_check(_peer_id, self._config['REG_ACL']):
                     # Build the configuration data strcuture for the peer
@@ -405,6 +407,9 @@ class HBSYSTEM(DatagramProtocol):
                 else:
                     self.transport.write('MSTNAK'+_peer_id, _sockaddr)
                     logger.warning('(%s) Invalid Login from Radio ID: %s Denied by Registation ACL', self._system, int_id(_peer_id))
+            else:
+                self.transport.write('MSTNAK'+_peer_id, _sockaddr)
+                logger.warning('(%s) Registration denied from Radio ID: %s Maximum number of peers exceeded', self._system, int_id(_peer_id))
 
         elif _command == 'RPTK':    # Repeater has answered our login challenge
             _peer_id = _data[4:8]