Fixed CRC problem

src/command_message.c

@@ -35,8 +35,10 @@ uint8_t command_calculate_crc(struct command_message_t *msg) {
 	uint8_t crc = 0;
 
 	uint8_t *byte_ptr = (uint8_t *)msg;
+	int loop_length = (sizeof(struct command_message_t) - sizeof(msg->data) + msg->length);
 
-	for (int i = 0; i < (sizeof(struct command_message_t) - sizeof(msg->data) + msg->length) - 1; i++) {
+	for (int i = 0; i < loop_length; i++) {
+		if (i == 4) { continue; }
 		sum += byte_ptr[i];
 	}