Added some connection client locks to make sure that nothing interrupts a connection send/receive routine.

src/packetserver/client/__init__.py

@@ -7,6 +7,7 @@ import ax25
 import logging
 import signal
 import time
+from threading import Lock
 from msgpack.exceptions import OutOfData
 from typing import Callable, Self, Union, Optional
 from traceback import  format_exc
@@ -23,6 +24,8 @@ class Client:
         self.callsign = client_callsign
         self.app = pe.app.Application()
         self.started = False
+        self._connection_locks = {}
+        self.lock_locker = Lock()
         signal.signal(signal.SIGINT, self.exit_gracefully)
         signal.signal(signal.SIGTERM, self.exit_gracefully)
 
@@ -85,6 +88,9 @@ class Client:
             raise RuntimeError("Must start client before creating connections.")
         if not ax25.Address.valid_call(dest):
             raise ValueError(f"Provided destination callsign '{dest}' is invalid.")
+        with self.lock_locker:
+            if dest.upper() not in self._connection_locks:
+                self._connection_locks[dest.upper()] = Lock()
         conn = self.connection_callsign(dest.upper())
         if conn is not None:
             return conn
@@ -103,6 +109,11 @@ class Client:
         if conn.state.name != "CONNECTED":
             raise RuntimeError("Connection is not connected.")
         logging.debug(f"Sending request {req}")
+        dest = conn.remote_callsign.upper()
+        with self.lock_locker:
+            if dest not in self._connection_locks:
+                self._connection_locks[dest] = Lock()
+        with self._connection_locks[dest]:
             conn.send_data(req.pack())
             cutoff_date = datetime.datetime.now() + datetime.timedelta(seconds=timeout)
             while datetime.datetime.now() < cutoff_date: