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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.

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roMoon
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  • I believe you will get retransmission when the packet is not acknowledged. I am not familiar with the sniffer you are using, but generally you should observe a `NULL` packet in response to a packet received. What does the spectrum look like? Is the environment noisy? – cirrusio Jan 20 '21 at 18:17

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