C : Maximum number of backoffs attempts before declaring CCA failure (use Thread stack default if not specified)
C : Maximum number of retries allowed after a transmission failure (use Thread stack default if not specified)
b : Set to true to enable CSMA-CA for this packet, false otherwise. (default true).
Set to true to enable CSMA-CA for this packet, false to disable both CSMA backoff and CCA.
When it is set to false, the frame MUST be sent without performing CCA. In this case mMaxCsmaBackoffs MUST also be ignored.
b : Set to true to indicate if header is updated - related to mIsHeaderUpdated in otRadioFrame (default false).
Indicates whether frame counter and CSL IEs are properly updated in the header.
If the platform layer does not provide OT_RADIO_CAPS_TRANSMIT_SEC capability, it can ignore this flag.
If the platform provides OT_RADIO_CAPS_TRANSMIT_SEC capability, then platform is expected to handle tx
security processing and assignment of frame counter. In this case the following behavior is expected:
When mIsHeaderUpdated is set, it indicates that OpenThread core has already set the frame counter and
CSL IEs (if security is enabled) in the prepared frame. The counter is ensured to match the counter value
from the previous attempts of the same frame. The platform should not assign or change the frame counter
(but may still need to perform security processing depending on mIsSecurityProcessed flag).
If mIsHeaderUpdated is not set, then the frame counter and key CSL IE not set in the frame by
OpenThread core and it is the responsibility of the radio platform to assign them. The platform
must update the frame header (assign counter and CSL IE values) before sending the frame over the air,
however if the the transmission gets aborted and the frame is never sent over the air (e.g., channel
access error) the platform may choose to not update the header. If the platform updates the header,
it must also set this flag before passing the frame back from the otPlatRadioTxDone() callback.
b : Set to true to indicate it is a retransmission - related to mIsARetx in otRadioFrame (default false).
Indicates whether the frame is a retransmission or not.
C : RX channel after TX done (default assumed to be same as channel in metadata)
The RX channel after frame TX is done (after all frame retries - ack received, or timeout, or abort).
Radio platforms can choose to fully ignore this. OT stack will make sure to call otPlatRadioReceive()
with the desired RX channel after a frame TX is done and signaled in otPlatRadioTxDone() callback.
Radio platforms that don't provide OT_RADIO_CAPS_TRANSMIT_RETRIES must always ignore this.
This is intended for situations where there may be delay in interactions between OT stack and radio, as an example this is used in RCP/host architecture to make sure RCP switches to PAN channel more quickly. In particular, this can help with CSL tx to a sleepy child, where the child may use a different channel for CSL than the PAN channel. After frame tx, we want the radio/RCP to go back to the PAN channel quickly to ensure that parent does not miss tx from child afterwards, e.g., child responding to the earlier CSL transmitted frame from parent using PAN channel while radio still staying on CSL channel.
The switch to the RX channel MUST happen after the frame TX is fully done, i.e., after all retries and when ack is received (when "Ack Request" flag is set on the TX frame) or ack timeout. Note that ack is expected on the same channel that frame is sent on.
b : Set to true to indicate security was processed on tx frame mIsSecurityProcessed in otRadioFrame (default false).
True if SubMac should skip the AES processing of this frame.
C : Channel (for frame tx) - MUST be included.
L : TX delay interval used for CSL - related to mTxDelay in otRadioFrame (default zero).
The delay time in microseconds for this transmission referenced to mTxDelayBaseTime.
Note: mTxDelayBaseTime + mTxDelay SHALL point to the point in time when the end of the SFD will be present at the local
antenna, relative to the local radio clock.
If this field is non-zero, mMaxCsmaBackoffs should be ignored.
This field does not affect CCA behavior which is controlled by mCsmaCaEnabled.
L : TX delay based time used for CSL - related to mTxDelayBaseTime in otRadioFrame (default zero).
The base time in microseconds for scheduled transmissions relative to the local radio clock, see otPlatRadioGetNow and mTxDelay.
If this field is non-zero, mMaxCsmaBackoffs should be ignored.
This field does not affect CCA behavior which is controlled by mCsmaCaEnabled.
See
SpinelPropertyId.STREAM_RAW