serialization and deserialization

relay/bluetooth_handler.py

@@ -55,6 +55,10 @@ class BluetoothHandler:
         
         self.advertise()
         
+    def deserialize_msg(self, s: bytes):
+        # returns packet type (int) and deserialized data
+        return s[0], eval(s[1:].decode())
+        
     def _get_mac_address(self):
         mac = self.ble.config("mac")[1]
         return ':'.join('{:02X}'.format(b) for b in mac)
@@ -109,9 +113,8 @@ class BluetoothHandler:
         elif event == IRQ_GATTS_WRITE:
             conn_handle, value_handle = data
 
-            if value_handle == self.tx_handle:
-                msg = self.ble.gatts_read(self.tx_handle)
+            msg = self.ble.gatts_read(value_handle)
+            packet_type, msg = self.deserialize_msg(msg)
+            
+            print(f"Received: \"{msg}\"")
             
-                if msg == b"ping":
-                    for conn in self.connections:
-                        self.ble.gatts_notify(conn, self.rx_handle, b"pong")