Bluetooth connect timeout after Android phone app disconnect and reconnect (IDFGH-4889)

[cattledogGH]

ESP32 Dev Module, Arduino Core 1.0.5,

BluetoothSerial.h included with core library properties shows
name=BluetoothSerial version=1.0 author=Evandro Copercini maintainer=Evandro Copercini sentence=Simple UART to Classical Bluetooth bridge for ESP32 paragraph= category=Communication url= architectures=esp32

When using BluetoothSerial.h and library example SerialToSerialBT with an Android phone (Kai Morich SerialBluetoothTerminal) the phone app can not reconnect after disconnect without restarting the ESP32.

Initial connection and example code work as expected. Disconnect phone app. Phone will not reconnect without ESP32 reset.

I believe that this issue is related to this issue which was repaired in the esp-idf
https://github.com/espressif/esp-idf/issues/1537

Request that the reconnection error be corrected in BluetoothSerial.h for ESP32.

[cattledogGH]

Posted to esp-idf in error. Should have been posted to
https://github.com/espressif/arduino-esp32

Can this be moved?

[TianaESP]

Hi @cattledogGH,

It's ok to leave it here. For the issue you mentioned, can you please provide more information including IDF version you use and any necessary log you have? Thanks.

[projectgus]

Arduino Core 1.0.5 is built with ESP-IDF release/v3.3 branch commit 7a85334d8

[cattledogGH]

This failure to reconnect after disconnect does not occur when using Arduino Core version 1.0.4. which uses IDF v 3.2
Something was broken with the update to 1.0.5.
I have not attempted to trace the behaviour in all the release candidates between 1.0.4 and 1.0.5

[lbernstone]

See #4912

[cattledogGH]

"See #4912"

Unlike what was presented in 4912 WiFi does not need to be involved for the disconnect/reconnect behavior.

This issue may also be related to #4919

[cattledogGH]

I can not confirm that the file revisions of #4912 correct the issue of failure to reconnect when using the BluetoothSerial library example SerialToSerialBT with an Android phone.
I installed the revised BluetoothSerial.h file and the revised esp32-hal-bt.c files into core 1.0.5 but there was not change in the failure to reconnect after a disconnect without restarting the Arduino.
As previously noted, this behaviour does not occur with core version 1.0.4

[me-no-dev]

I do not have an Android phone, but some fixes have been added to current master (and will come in 1.0.6), so I would ask you if you can give it a go and confirm?

[cattledogGH]

@me-no-dev

I do not have an Android phone, but some fixes have been added to current master (and will come in 1.0.6), so I would ask you if you can give it a go and confirm?

I have tested the changes in these files, and they do not solve the problem.
4d95e3a

Is there something else you would like me to test?

[me-no-dev]

@cattledogGH I would suggest that you try directly with master

[cattledogGH]

I have only loaded the Arduino core using the Boards Manager of the Arduino IDE. What is the process for getting the master into the packages of the Arduino 15 folder? I am using Windows 10. Arduino IDE 1.8.13

[me-no-dev]

https://github.com/espressif/arduino-esp32/blob/master/docs/arduino-ide/windows.md but uninstall from board manager first

[cattledogGH]

Yes, I believe the current master fixes the issue.

I followed the instructions referenced in the previous comment, and I think that I have successfully installed the current master, but I'm not quite sure where to pull a version number from the compiling report to absolutely confirm what was used.

With the sketch from the SerialBluetooth library "SerialToSerialBluetooth" and the current master, I can connect and disconnect repeatedly without restarting the ESP 32.

I look forward to Arduino Core 1.0.6. available through the Board Manager.