I am transmitting data from my development board to an Android Phone with Bluetooth SPP，and I am confusing about the SPP data retransmission.
According to the Bluetooth spec, packet is retransmitted if the sender receives a response packet with ARQN = 0. However, on my air packets log, I see a lot spp retransmission with out receiving any response, and I am curious about it.
I am afraid the retransmission decrease my throughput.
Does anyone know why the retransmission exist? thanks.
