ESP32 SPP send throughput

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gunar.kroeger
Posts: 67
Joined: Fri Jul 27, 2018 6:48 pm

Re: ESP32 SPP send throughput

Postby gunar.kroeger » Thu Nov 22, 2018 12:01 pm

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
"Running was invented in 1612 by Thomas Running when he tried to walk twice at the same time."

peterlspot
Posts: 13
Joined: Thu Mar 29, 2018 11:22 pm

Re: ESP32 SPP send throughput

Postby peterlspot » Sun Apr 14, 2019 9:43 am

blueMoodBHD wrote:
Thu Nov 22, 2018 10:01 am
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
Posts: 1
Joined: Tue Apr 16, 2019 11:54 am

Re: ESP32 SPP send throughput

Postby Raviteja_K » Wed Apr 17, 2019 10:48 am

Did anyone got solution for this???

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