modules: openthread: radio_nrf5: fix selective TX channel

When the selective TX channel feature is used, delayed
transmissions should not cause switching the current channel
to the channel of the current transmission. The purpose
of this feature is to be able to transmit selected frames
on a channel other than the PAN channel.

Signed-off-by: Damian Krolik <[email protected]>

Author: Damian-Nordic

modules/openthread/platform/radio_nrf5.c

@@ -801,7 +801,9 @@ static otError transmit_frame(otInstance *aInstance)
 	if ((nrf5_data.capabilities & OT_RADIO_CAPS_TRANSMIT_TIMING) &&
 	    (nrf5_data.tx.frame.mInfo.mTxInfo.mTxDelay != 0)) {
 
-		nrf5_set_channel(nrf5_data.tx.frame.mChannel);
+		if (!IS_ENABLED(CONFIG_NRF5_SELECTIVE_TXCHANNEL)) {
+			nrf5_set_channel(nrf5_data.tx.frame.mChannel);
+		}
 
 		if (!nrf5_tx_at(&nrf5_data.tx.frame, nrf5_data.tx.psdu)) {
 			LOG_WRN("TX AT failed");