ot::Trel::Link::Send() method
Requests a frame to be sent over TREL radio link. The frame should be already placed in `GetTransmitFrame()` frame. `Mac::RecordFrameTransmitStatus()` and `Mac::HandleTransmitDone()` are used to notify the success or error status of frame transmission upon completion of send.
ot::Trel::Link::Send() calls 2 functions:
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ot::Trel::Link::Send()
ot::Trel::Link::Send() reads 3 variables:
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ot::Trel::Link::Send()