Added new default_ack_send_count config option

There may be applications where the admin might not want a hard
coded 3 acks sent for every RX'd packet.  This patch adds the
ability to change the number of acks sent per RX'd packet.
The default is still 3.

aprsd/conf/common.py

@@ -105,6 +105,11 @@ aprsd_opts = [
              "'multiline' will use multiple lines for each packet and is the traditional format."
              "both will log both compact and multiline.",
     ),
+    cfg.IntOpt(
+        "default_ack_send_count",
+        default=3,
+        help="The number of times to send an ack packet in response to recieving a packet.",
+    ),
 ]
 
 watch_list_opts = [

aprsd/threads/tx.py

@@ -157,22 +157,24 @@ class SendPacketThread(aprsd_threads.APRSDThread):
 
 class SendAckThread(aprsd_threads.APRSDThread):
     loop_count: int = 1
+    max_retries = 3
 
     def __init__(self, packet):
         self.packet = packet
         super().__init__(f"SendAck-{self.packet.msgNo}")
+        self.max_retries = CONF.default_ack_send_count
 
     def loop(self):
         """Separate thread to send acks with retries."""
         send_now = False
-        if self.packet.send_count == self.packet.retry_count:
+        if self.packet.send_count == self.max_retries:
             # we reached the send limit, don't send again
             # TODO(hemna) - Need to put this in a delayed queue?
             LOG.debug(
                 f"{self.packet.__class__.__name__}"
                 f"({self.packet.msgNo}) "
                 "Send Complete. Max attempts reached"
-                f" {self.packet.retry_count}",
+                f" {self.max_retries}",
             )
             return False