BLEServer - Esp32 in reboot loop after specific line of code

[fearless_potato]

Hello,

I am trying to set up a BLEServer with my Esp32 module and whenever there is no more client connected to the server it should go back to sleep. I wanted to acheieve that with the function getConnectedCount() of the class BLEServer. However, whenever this specific line of code gets called, in my code the first time when it happens is in the setup() function, the esp32 gets into an endless reboot loop.
It happens just after this line in the following code block : connected pServer->getConnectedCount();

Code: [Select all] [Expand/Collapse]

1. #include <WiFi.h>
2. #include <BLEDevice.h>
3. #include <BLEUtils.h>
4. #include <BLEServer.h>
5. #include <stdint.h>
6. #include "time.h"
7.  
8.  
9. #define uS_TO_S_FACTOR 1000000ULL  // museconds to seconds
10. #define BUZZER 4
11. #define SERVICE_UUID        "144c4a01-27f0-4583-9e67-b18fd02575c8"
12. #define CHARACTERISTIC_UUID "074db863-df24-4ffa-a05c-6ea474a88208"
13. #define HOURS(X) (X)*60*60*uS_TO_S_FACTOR
14. #define SECONDS(X) (X)*uS_TO_S_FACTOR
15. #define TIMEOUT 10000
16.  
17.  
18. volatile const int ping = 0xA1;
19. volatile const int mute = 0xB1;
20. uint32_t connected = 0;
21.  
22. BLEServer *pServer;
23.  
24. void powerSave(uint64_t sleepTime){
25.   setCpuFrequencyMhz(80);
26.   WiFi.disconnect(true);
27.   WiFi.mode(WIFI_OFF);
28.   btStop();
29.   esp_sleep_enable_timer_wakeup(sleepTime);
30.   esp_deep_sleep_start();
31. }
32.  
33. void startBLE(){
34.   esp_bt_controller_enable(ESP_BT_MODE_BLE);
35.   BLEDevice::init("BluePing");
36.   BLEServer *pServer = BLEDevice::createServer();
37.   BLEService *pService = pServer->createService(SERVICE_UUID);
38.   BLECharacteristic *pCharacteristic = pService->createCharacteristic(
39.                                          CHARACTERISTIC_UUID,
40.                                          BLECharacteristic::PROPERTY_READ |
41.                                          BLECharacteristic::PROPERTY_WRITE
42.                                        );
43.  
44.   pService->start();
45.   BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
46.   pAdvertising->addServiceUUID(SERVICE_UUID);
47.   pAdvertising->setScanResponse(true);
48.   pAdvertising->setMinPreferred(0x06);  
49.   pAdvertising->setMinPreferred(0x12);
50.   BLEDevice::startAdvertising();
51. }
52.  
53. void checkBLE(){
54.   connected = pServer->getConnectedCount();
55.   while(connected != 0){
56.     // execute commands if present
57.     connected = pServer->getConnectedCount(); // Keine verbindung mehr -> raus
58.   }
59. }
60.  
61. void setup() {
62.   // if(getsleepmodeform rtc memoy) powerSave(HOURS()); // sleepMode -> für jeweilige hours sleepen
63.   Serial.begin(115200);
64.   pinMode(BUZZER, OUTPUT);
65.   startBLE();
66.   connected = pServer->getConnectedCount();
67.   unsigned long currentMil = millis();
68.   while (connected == 0){ // ready to pair
69.     Serial.println("looking to pair");
70.   //connected = pServer->getConnectedCount(); // if client hat sich verbunden -> raus
71.     if (millis() - currentMil >= (TIMEOUT * 1UL)){
72.       Serial.println("timeout, no conn found");
73.       break; // zeit überschritten -> raus
74.     }
75.   }
76.   if (connected > 0) checkBLE();
77.   powerSave(SECONDS(10)); //  muss nach erst ausgeführt werden wenn keine connection mehr besteht
78. }
79.  
80. void loop() {}

GeSHi © Codebox Plus Extension

I get this repeating reboot message:

Code: [Select all] [Expand/Collapse]

1.  
2. Rebooting...
3. ets Jun  8 2016 00:22:57
4.  
5. rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
6. configsip: 0, SPIWP:0xee
7. clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
8. mode:DIO, clock div:1
9. load:0x3fff0018,len:4
10. load:0x3fff001c,len:1216
11. ho 0 tail 12 room 4
12. load:0x40078000,len:9720
13. ho 0 tail 12 room 4
14. load:0x40080400,len:6352
15. entry 0x400806b8
16. Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
17. Core 1 register dump:
18. PC      : 0x401c0f37  PS      : 0x00060f30  A0      : 0x800d1178  A1      : 0x3ffcdc50  
19. A2      : 0x00000000  A3      : 0x3eaa9c81  A4      : 0x3f4015a5  A5      : 0x00000003  
20. A6      : 0x00000001  A7      : 0x00000000  A8      : 0x800d10f6  A9      : 0x3ffcdc10  
21. A10     : 0x3ffe2c68  A11     : 0x00000012  A12     : 0x3ffc5dc8  A13     : 0x3f40198c  
22. A14     : 0xffffffff  A15     : 0x00000000  SAR     : 0x00000018  EXCCAUSE: 0x0000001c  
23. EXCVADDR: 0x00000034  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  
24.  
25. Backtrace: 0x401c0f37:0x3ffcdc50 0x400d1175:0x3ffcdc70 0x400d6d63:0x3ffcdca0 0x4008eb51:0x3ffcdcc0

GeSHi © Codebox Plus Extension

Thanks in advance!

[fearless_potato]

By the way, in numerous similar threads I have read that the Brownout protection might be triggered. However, this probably isn’t the case since it happens even with a power 5V 2A power supply.

[lbernstone]

Decode your backtrace with https://github.com/me-no-dev/EspExceptionDecoder
The esp32 uses 3V3, so your 5V input is being reduced by a power supply which may not provide enough power. If the backtrace indicates an issue in wifi or phy init, that does indicate a power problem.

[fearless_potato]

Alright, did that, got the following result:

Code: [Select all] [Expand/Collapse]

1. PC: 0x401c0fdb: BLEServer::getConnectedCount() at C:\Users\leoni\Dokumente\ArduinoData\packages\esp32\hardware\esp32\1.0.4\libraries\BLE\src\BLEServer.cpp line 126
2. EXCVADDR: 0x00000034
3.  
4. Decoding stack results
5. 0x401c0fdb: BLEServer::getConnectedCount() at C:\Users\leoni\Dokumente\ArduinoData\packages\esp32\hardware\esp32\1.0.4\libraries\BLE\src\BLEServer.cpp line 126
6. 0x400d1212: setup() at C:\Users\leoni\Dokumente\Arduino\esp32aktuell/esp32aktuell.ino line 98
7. 0x400d6e07: loopTask(void*) at C:\Users\leoni\Dokumente\ArduinoData\packages\esp32\hardware\esp32\1.0.4\cores\esp32\main.cpp line 14
8. 0x4008eb51: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

GeSHi © Codebox Plus Extension

Currently trying to make sense of it. But it is, as I thought, caused by the getConnectedCount().

Thank you!!