Full C++ and Python impl

telemetry_common.cpp

@@ -0,0 +1,22 @@
+// Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+// SPDX-License-Identifier: MIT
+#include "telemetry_common.h"
+#include <stdlib.h>
+
+uint16_t crc16_ccitt(const uint8_t *data, uint16_t length) {
+  uint16_t crc = 0xFFFF;
+
+  for (uint16_t i = 0; i < length; i++) {
+    crc ^= (uint16_t)data[i] << 8;
+
+    for (uint8_t j = 0; j < 8; j++) {
+      if (crc & 0x8000)
+        crc = (crc << 1) ^ 0x1021;
+      else
+        crc <<= 1;
+    }
+  }
+
+  return crc;
+}