Failure to re-connect Bluetooth SPP

[lyusupov]

Hardware:

Board: ESP32 Dev Module
Core Installation version: 1.0.5
IDE name: Arduino IDE
Flash Frequency: 80Mhz
PSRAM enabled: yes
Upload Speed: 115200
Computer OS: Windows 10

Description:

Very first Bluetooth SPP connection to an ESP32 device works fine.
However, when we do disconnect and connect action again - the 2nd connection is no longer established.
The only way to get it back - is to make a reset of the ESP32 device.

This happens with recent 1.0.5 release only - 1.0.4 is doing good.

[lyusupov]

To reproduce:

1. build the standard SerialToSerialBT example with verbose debug option enabled, then install the sketch into an ESP32

2. connect a Bluetooth SPP terminal application to the ESP32

3. type in something

4. disconnect

5. try to connect again

This is a log of the ESP32 console output:

rst:0x10 (RTCWDT_RTC_RESET),boot:0x37 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8
;TµUÍÁÍ2-hal-cpu.c:189] setCpuFrequencyMhz(): PLL: 320 / 4 = 80 Mhz, APB: 800000                                                                             00 Hz
[D][esp32-hal-psram.c:62] psramInit(): PSRAM enabled
ÿ[I][BluetoothSerial.cpp:553] _init_bt(): device name set
The device started, now you can pair it with bluetooth!
[I][BluetoothSerial.cpp:228] esp_spp_cb(): ESP_SPP_INIT_EVT
[I][BluetoothSerial.cpp:231] esp_spp_cb(): ESP_SPP_INIT_EVT: slave: start
[I][BluetoothSerial.cpp:329] esp_spp_cb(): ESP_SPP_START_EVT
[V][BluetoothSerial.cpp:417] esp_bt_gap_cb(): authentication success: Android Phone
[I][BluetoothSerial.cpp:239] esp_spp_cb(): ESP_SPP_SRV_OPEN_EVT
[V][BluetoothSerial.cpp:290] esp_spp_cb(): ESP_SPP_DATA_IND_EVT len=7 handle=129
qqqqq
[V][BluetoothSerial.cpp:290] esp_spp_cb(): ESP_SPP_DATA_IND_EVT len=13 handle=129
qqqqqrrrrrr
[I][BluetoothSerial.cpp:255] esp_spp_cb(): ESP_SPP_CLOSE_EVT

[lyusupov]

Duplicates #4915