Optimization of the RX symbol timeout.
Optimization of the RX symbol timeout.

seanelaval/LoRaMac-node,abouillot/LoRaMac-node,seanelaval/LoRaMac-node,imec-idlab/LoRaMac-node,reixd/LoRaMac-node,abouillot/LoRaMac-node,reixd/LoRaMac-node,seanelaval/LoRaMac-node,imec-idlab/LoRaMac-node