ESP32 SPP send throughput

[gunar.kroeger]

We should wait for ESP_SPP_WRITE_EVT, then call esp_spp_write() again

Yes, but even so, after a while we get the congestion event.
Try writing a task with an EventGroupHandle_t that waits for the ESP_SPP_WRITE_EVT and then calls esp_spp_write().
This should give the fastest throughput possible, but sadly fails

[peterlspot]

Hi all，
There is one thing that needs attention here. We can't call esp_spp_write() multiple times in succession. We should wait for ESP_SPP_WRITE_EVT, then call esp_spp_write() again.
So, when do you call esp_spp_write()？If you call it multiple times in succession, please change it and test again.
Thanks.

I am currently calling esp_spp_write() in another task (not the task calling my SPP callbacks). However, I have a spp_congested flag managed by the SPP callback task and the flag is respected before calling esp_spp_write(). Is this fine?

BTW, just to add another observation: with IDF3.1 SPP sending only works well with RedMi 4x and it was extremely slow with other Android devices (such as MiPad, Huawei phone).

Today I tried IDF v3.2 using the same SPP app, I can reach much higher sending speed with the MiPad that fails before. It seems that IDF v3.2 contains some SPP inter-operability improvements??? Can someone from ESPRESSIF confirm this?

Meanwhile,I will try IDF v3.2 with other failed Android devices later...

[Raviteja_K]

Did anyone got solution for this???