I need to transfer files over bluetooth and it should be as fast as possible, but even if I wait for the ESP_SPP_WRITE_EVT before writing the next message I get the ESP_SPP_CONG_EVT. On my newer phone this congestion clears in about 10ms, which is fine because I still got a speed of 93kb/s. But on an older phone it took about 1,5 seconds, bringing transfer speed down to 11kb/s.
Another question I have is if when receiving ESP_SPP_WRITE_EVT with param->write.cong == 1, will the android app get the full message, or a broken one or none at all?
Thanks
