ESP32 Forum

Hi,
I test with master tree (v3.3-dev-270-g6f8e2b018).
When BT and Wifi are both enabled, it's easy to observe "TCP Spurious Retransmission" issue.
In my case, I only use BLE by calling esp_ble_gap_start_scanning().
The scan_interval=0x50 and scan_widow=0x30 in my setting.

If I comment out the esp_ble_gap_start_scanning() call, I don't observe the issue.
So I guess this might be related to BT+WiFi co-exist issue?

Hi,
try SW coexistnce option in menuconfig with wifi priority. ble should not lose too much but it will change your wifi behavior a lot, at least i experienced it in my test app. I even could set scan interval and windows with the same value and wifi didnt complain about it.

Set SW coexistnce with wifi priority reduce the chance or TCP Spurious Retransmission, but it still can happen.
Comment out esp_ble_gap_start_scanning() then the TCP Spurious Retransmission never happen.
I do believe there are some issues with bt+wifi coexist...