check for max bandwidth on session open

gui/package.json

@@ -2,7 +2,7 @@
   "name": "FreeDATA",
   "description": "FreeDATA Client application for connecting to FreeDATA server",
   "private": true,
-  "version": "0.14.4-alpha",
+  "version": "0.14.5-alpha",
   "main": "dist-electron/main/index.js",
   "scripts": {
     "start": "vite",

modem/arq_session.py

@@ -164,8 +164,9 @@ class ARQSession:
 
         return stats
 
-    def get_appropriate_speed_level(self, snr):
-        maximum_bandwidth = self.config['MODEM']['maximum_bandwidth']
+    def get_appropriate_speed_level(self, snr, maximum_bandwidth=None):
+        if maximum_bandwidth is None:
+            maximum_bandwidth = self.config['MODEM']['maximum_bandwidth']
 
         # Adjust maximum_bandwidth based on special conditions or invalid configurations
         if maximum_bandwidth == 0:
@@ -176,9 +177,7 @@ class ARQSession:
         appropriate_speed_level = min(self.SPEED_LEVEL_DICT.keys())
 
         for level, details in self.SPEED_LEVEL_DICT.items():
-            if snr >= details['min_snr'] and details['bandwidth'] <= maximum_bandwidth:
-                # Update appropriate_speed_level to the current level if it meets both SNR and bandwidth criteria
-                if level > appropriate_speed_level:
-                    appropriate_speed_level = level
+            if snr >= details['min_snr'] and details['bandwidth'] <= maximum_bandwidth and level > appropriate_speed_level:
+                appropriate_speed_level = level
 
         return appropriate_speed_level

modem/arq_session_irs.py

@@ -76,6 +76,8 @@ class ARQSessionIRS(arq_session.ARQSession):
         self.received_bytes = 0
         self.received_crc = None
 
+        self.maximum_bandwidth = 0
+
         self.abort = False
 
     def all_data_received(self):
@@ -98,6 +100,12 @@ class ARQSessionIRS(arq_session.ARQSession):
         thread_wait.start()
     
     def send_open_ack(self, open_frame):
+        self.maximum_bandwidth = open_frame['maximum_bandwidth']
+        # check for maximum bandwidth. If ISS bandwidth is higher than own, then use own
+        if open_frame['maximum_bandwidth'] > self.config['MODEM']['maximum_bandwidth']:
+            self.maximum_bandwidth = self.config['MODEM']['maximum_bandwidth']
+
+
         self.event_manager.send_arq_session_new(
             False, self.id, self.dxcall, 0, self.state.name)
         ack_frame = self.frame_factory.build_arq_session_open_ack(
@@ -211,7 +219,7 @@ class ARQSessionIRS(arq_session.ARQSession):
             received_speed_level = 0
 
         latest_snr = self.snr if self.snr else -10
-        appropriate_speed_level = self.get_appropriate_speed_level(latest_snr)
+        appropriate_speed_level = self.get_appropriate_speed_level(latest_snr, self.maximum_bandwidth)
         modes_to_decode = {}
 
         # Log the latest SNR, current, appropriate speed levels, and the previous speed level

modem/arq_session_iss.py

@@ -104,9 +104,10 @@ class ARQSessionISS(arq_session.ARQSession):
         twr.start()
 
     def start(self):
+        maximum_bandwidth = self.config['MODEM']['maximum_bandwidth']
         self.event_manager.send_arq_session_new(
             True, self.id, self.dxcall, self.total_length, self.state.name)
-        session_open_frame = self.frame_factory.build_arq_session_open(self.dxcall, self.id)
+        session_open_frame = self.frame_factory.build_arq_session_open(self.dxcall, self.id, maximum_bandwidth)
         self.launch_twr(session_open_frame, self.TIMEOUT_CONNECT_ACK, self.RETRIES_CONNECT, mode=FREEDV_MODE.signalling)
         self.set_state(ISS_State.OPEN_SENT)
 

modem/data_frame_factory.py

@@ -98,6 +98,7 @@ class DataFrameFactory:
             "destination_crc": 3,
             "origin": 6,
             "session_id": 1,
+            "maximum_bandwidth": 2,
         }
 
         self.template_list[FR_TYPE.ARQ_SESSION_OPEN_ACK.value] = {
@@ -219,7 +220,7 @@ class DataFrameFactory:
 
             elif key in ["session_id", "speed_level", 
                             "frames_per_burst", "version",
-                            "offset", "total_length", "state", "type"]:
+                            "offset", "total_length", "state", "type", "maximum_bandwidth"]:
                 extracted_data[key] = int.from_bytes(data, 'big')
 
             elif key in ["snr"]:
@@ -328,11 +329,12 @@ class DataFrameFactory:
         test_frame[:1] = bytes([FR_TYPE.TEST_FRAME.value])
         return test_frame
 
-    def build_arq_session_open(self, destination, session_id):
+    def build_arq_session_open(self, destination, session_id, maximum_bandwidth):
         payload = {
             "destination_crc": helpers.get_crc_24(destination),
             "origin": helpers.callsign_to_bytes(self.myfullcall),
             "session_id": session_id.to_bytes(1, 'big'),
+            "maximum_bandwidth": maximum_bandwidth.to_bytes(2, 'big'),
         }
         return self.construct(FR_TYPE.ARQ_SESSION_OPEN, payload)
 

modem/server.py

@@ -33,7 +33,7 @@ from schedule_manager import ScheduleManager
 app = Flask(__name__)
 CORS(app, resources={r"/*": {"origins": "*"}})
 sock = Sock(app)
-MODEM_VERSION = "0.14.4-alpha"
+MODEM_VERSION = "0.14.5-alpha"
 
 # set config file to use
 def set_config():