I’m using Xbee3 802.15.4 for a token-ring broadcast message net.
I’m using ATRR application-layer retries sets to 4 (so 6 retries).
MM (MAC MODE) is set to 0 (Digi mode with ACKS).
The ACK is used ONLY to detect in any station when the DIGI finished to send Broadcast packet.
I need to improve the synchronism of time-slot (timings when Sn receive a packet and send its data to other stations).
Would be very useful if in DIGI header the number of retry is noticed.
This could help me to say:
Ah OK I’ve received the 4th retry of 6 so before to talk (if is my turn) I have to wait at least time_to_send_all_retries - (remaining_retries * time_to_a_retry_on_air).
The ON air sent_time is very constant (just some ms of jit) so the improvement will be huge.
S3.DIGI send a packet on air with 6 retries in broadcast.
S4.DIGI received the packet and in some way know what of six retries IS.
S4.DIGI calculate the optimum delay time and send its packet on air with 6 retries in broadcast.