Decoding payload

Packets had been decoded and the dataclass added to have a cleaner
structure.

bench-data-connector/src/bench_data_connector/__init__.py

@@ -1,7 +1,20 @@
 from serial.tools import list_ports
 from serial import Serial
+from dataclasses import dataclass
 import struct
 
+DATA_STRUCT = struct.Struct("<BIf")
+
+@dataclass
+class SensorData:
+    data_type:int
+    timestamp:int
+    value:float
+    @classmethod
+    def from_bytes(cls, payload: bytes):
+        data_type, timestamp, value = DATA_STRUCT.unpack(payload)
+        return cls(data_type=data_type, timestamp=timestamp, value=value)
+
 def main() -> None:
     try:
         print("Hello from bench-data-connector!")
@@ -31,18 +44,32 @@ def main() -> None:
     with Serial(selected_port,baudrate=115200,timeout=1) as ser:
         while True:
             start_sync(ser)
-            print("paquet trouvé")
-            payload = ser.read(9) # 9 corresponds to the payload size of the data frame
+            #print("paquet trouvé")
+            print(DATA_STRUCT.size)
+            payload = read_exactly(ser, DATA_STRUCT.size)
+            
             if not payload:
                 continue
-            crc = ser.read(2)
+            crc = read_exactly(ser, 2)
             if not crc:
                 continue
             received_crc = struct.unpack("<H", crc)[0]
             calculated_crc = crc16_ccitt(payload)
             if calculated_crc != received_crc:
                 continue
-            print("paquet sécurisé")
+            #print("paquet sécurisé")
+            print(SensorData.from_bytes(payload))
+            
+            
+
+def read_exactly(ser: Serial, size: int) ->bytes | None:
+    data = bytearray()
+    while len(data) < size:
+        packet_exact = ser.read(size - len(data))
+        if not packet_exact:
+            return None
+        data.extend(packet_exact)
+    return bytes(data)
 
 def crc16_ccitt(data: bytes) -> int:
     crc = 0xFFFF