Seperate into language folders

python/telemetry_common.py

@@ -0,0 +1,67 @@
+# Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+# Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+# SPDX-License-Identifier: MIT
+import struct
+from dataclasses import dataclass
+
+UART_MAGIC = b"\xAA\x55\xAA\x55"
+
+LORA_HEADER_FORMAT = "<BBBBH"
+UART_HEADER_FORMAT = "<4sB"
+PACKET1_FORMAT = "<4s"
+PACKET2_FORMAT = "<fffff"
+
+LORA_HEADER_SIZE = struct.calcsize(LORA_HEADER_FORMAT)
+UART_HEADER_SIZE = struct.calcsize(UART_HEADER_FORMAT)
+PACKET1_SIZE = struct.calcsize(PACKET1_FORMAT)
+PACKET2_SIZE = struct.calcsize(PACKET2_FORMAT)
+
+
+@dataclass
+class TelemetryLoRaHeader:
+    source: int
+    dest: int
+    version: int
+    size: int
+    crc16: int
+
+
+@dataclass
+class TelemetryPacket1:
+    ping: bytes
+
+
+@dataclass
+class TelemetryPacket2:
+    vbat: float
+    teng: float
+    lat: float
+    lng: float
+    speed: float
+
+
+def crc16_ccitt(data: bytes) -> int:
+    crc = 0xFFFF
+    for byte in data:
+        crc ^= byte << 8
+        for _ in range(8):
+            if crc & 0x8000:
+                crc = ((crc << 1) ^ 0x1021) & 0xFFFF
+            else:
+                crc = (crc << 1) & 0xFFFF
+    return crc
+
+
+def unpack_lora_header(data: bytes) -> TelemetryLoRaHeader:
+    source, dest, version, size, crc16 = struct.unpack(LORA_HEADER_FORMAT, data[:LORA_HEADER_SIZE])
+    return TelemetryLoRaHeader(source, dest, version, size, crc16)
+
+
+def unpack_packet1(payload: bytes) -> TelemetryPacket1:
+    (ping,) = struct.unpack(PACKET1_FORMAT, payload[:PACKET1_SIZE])
+    return TelemetryPacket1(ping)
+
+
+def unpack_packet2(payload: bytes) -> TelemetryPacket2:
+    vbat, teng, lat, lng, speed = struct.unpack(PACKET2_FORMAT, payload[:PACKET2_SIZE])
+    return TelemetryPacket2(vbat, teng, lat, lng, speed)