void echonet_start(EchonetConfig *config);
int echonet_start_and_wait(EchonetConfig *config, portTickType xBlockTime);
int echonet_send_packet(EchonetPacket *packet, struct sockaddr_in *addr);
int echonet_send_packet_and_wait_response(
    EchonetPacket *request, struct sockaddr_in *addr, EchonetPacket *response, uint8_t *buf);
void echonet_prepare_packet(EchonetPacket *packet);
void echonet_prepare_response_packet(EchonetPacket *request, EchonetPacket *response);
int echonet_packet_add_operation(EchonetPacket *packet, EchonetOperation *operation);
void echonet_copy_packet(EchonetPacket *dst, uint8_t *buf, EchonetPacket *src);
int echonet_build_protocol(EchonetProtocol *protocol, uint8_t *buf);
int echonet_nodeprofile_send_inf();