void TransmitNextByte() {
message_radio_header_t* header = getHeader((message_t*) txBufPtr);
if (byteCnt < header->length + sizeof(message_header_t) ) { // send (data + header), compute crc
void TransmitNextByte() {
message_radio_header_t* header = getHeader((message_t*) txBufPtr);
if (byteCnt < header->length + sizeof(message_header_t) ) { // send (data + header), compute crc