Clarification on new Transmission while another one is in progress

[testter2]

Hi All,

I am currently working with OpenThread and have a question regarding concurrent transmissions. Specifically, I'm interested in understanding how OpenThread handles situations where there is a need to initiate a new transmission while another transmission is already in progress.

I am working on a radio platform that supports CSMA. It seems that before the CSMA backoff delay fires, another frame is sent, and the radio platform returns an "invalid_state" error because the device is not in the receive state. I've noticed that there's a line of code SuccessOrAssert(error); at end of SubMac::BeginTransmit(void) that checks for an error return value that's not "success."

Is there any possible way to start a transmission while there's another one in progress?

Thanks in advance.

[jwhui]

OpenThread only supports one transmit operation at a time and should not call otPlatRadioTransmit() unless the radio is in the receive state.

[testter2]

Thanks for quick reply.