typedef bool (*send_data_t)(void *handle, uint8_t type, const char *data, size_t len);
typedef bool (*receive_record_t)(void *handle, uint8_t type, const char *data, uint16_t len);
typedef bool (*send_data_t)(void *handle, uint8_t type, const char *data, size_t len);
typedef bool (*receive_record_t)(void *handle, uint8_t type, const char *data, uint16_t len);