wifi.cpp scan hangs after declaring object instance

[rickAllDev]

Could you please explain the following

This scenario DOES NOT work for me:

WiFi wifi_debug;
auto results = wifi_debug.scan();
... hangs on:  0x4011cf9c: WiFiEventHandler::eventHandler(void*, system_event_t*) at C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/WiFiEventHandler.cpp:26

This scenario DOES work for me:

WiFi *pwifi1;
pwifi1 = new WiFi;
auto results = pwifi1->scan();

[nkolban]

I have tried to recreate and both scenarios worked for me.

Here is the task that I ran...

https://pastebin.com/YX52vgSK

The usual suspects apply ...

1. Refresh your ESP-IDF master Git image to the latest (a new one was delivered this week)
2. Rebuild everything (if in doubt, remove the project ./build directory which will get rebuilt)

[rickAllDev]

Installed latest espidf. Trying to re-compile - error in cpp_utils...

C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/BLEUtils.cpp:1290:52: error: 'struct esp_ble_gattc_cb_param_t::gattc_connect_evt_param' has no member named 'status'
     BLEUtils::gattStatusToString(evtParam->connect.status).c_str(),
                                                    ^
C:/esp/esp-idf/components/log/include/esp_log.h:242:168: note: in definition of macro 'ESP_LOGD'
 #define ESP_LOGD( tag, format, ... )  if (LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG)   { esp_log_write(ESP_LOG_DEBUG,   tag, LOG_FORMAT(D, format), esp_log_timestamp(), tag, ##__VA_ARGS__); }
                                                                                                                                                                        ^
C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/BLEUtils.cpp:1306:55: error: 'struct esp_ble_gattc_cb_param_t::gattc_disconnect_evt_param' has no member named 'status'
     BLEUtils::gattStatusToString(evtParam->disconnect.status).c_str(),
                                                       ^
C:/esp/esp-idf/components/log/include/esp_log.h:242:168: note: in definition of macro 'ESP_LOGD'
 #define ESP_LOGD( tag, format, ... )  if (LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG)   { esp_log_write(ESP_LOG_DEBUG,   tag, LOG_FORMAT(D, format), esp_log_timestamp(), tag, ##__VA_ARGS__); }
                                                                                                                                                                        ^
C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/BLEUtils.cpp: In static member function 'static void BLEUtils::dumpGattServerEvent(esp_gatts_cb_event_t, esp_gatt_if_t, esp_ble_gatts_cb_param_t*)':
C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/BLEUtils.cpp:1592:23: error: 'struct esp_ble_gatts_cb_param_t::gatts_connect_evt_param' has no member named 'is_connected'
     evtParam->connect.is_connected);
                       ^
C:/esp/esp-idf/components/log/include/esp_log.h:242:168: note: in definition of macro 'ESP_LOGD'
 #define ESP_LOGD( tag, format, ... )  if (LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG)   { esp_log_write(ESP_LOG_DEBUG,   tag, LOG_FORMAT(D, format), esp_log_timestamp(), tag, ##__VA_ARGS__); }
                                                                                                                                                                        ^
C:/Users/Rick/Documents/EclipseProjects/orb1/components/cpp_utils/BLEUtils.cpp:1609:23: error: 'struct esp_ble_gatts_cb_param_t::gatts_connect_evt_param' has no member named 'is_connected'
     evtParam->connect.is_connected);
                       ^
C:/esp/esp-idf/components/log/include/esp_log.h:242:168: note: in definition of macro 'ESP_LOGD'
 #define ESP_LOGD( tag, format, ... )  if (LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG)   { esp_log_write(ESP_LOG_DEBUG,   tag, LOG_FORMAT(D, format), esp_log_timestamp(), tag, ##__VA_ARGS__); }
                                                                                                                                                                        ^
make[1]: *** [/c/esp/esp-idf/make/component_wrapper.mk:243: BLEUtils.o] Error 1
make: *** [C:/esp/esp-idf/make/project.mk:435: component-cpp_utils-build] Error 2

[nkolban]

Howdy @rweller59
This sure is a moving target. Those good folks at Espressif changed the API structure that exposed the BLE APIs. To be clear in my explanation ... at the lowest level, there is the ESP32 hardware. Above that is a private implementation of Bluetooth that is super low level. This is called "Bluedroid". Above that is the ESP-IDF which is what ESP32 applications can program to. Above that is the BLE C++ classes that you are using now. The BLE C++ classes use the ESP-IDF that is exposed by Espressif.

About 2 days ago, that latest release of pre-3.0 ESP-IDF changed the data structures exposed by ESP-IDF that are used by BLE applications. This resulted in exactly the errors you encountered. Thankfully, a chap called @Philius caught the problem and quickly made code changes to the BLE C++ library. This was committed last night.

My hope/belief is that if you re-download the BLE C++ classes from this repository, all should be back in synch again.

How can we avoid these problems? Not easily I'm afraid. When ESP-IDF releases their 3.0 release, I'm also going to create a branch of the C++ classes that will always be guaranteed to work with 3.0. As ESP-IDF then moves on to their next release, there will then be two development streams in this repository. One which will be guaranteed to work with 3.0 and one that will keep in synch with the latest ESP-IDF.

If you or anyone else have better / alternate notions, I'm very open to hearing those about how you would like this library maintained.

Please let me know if a fresh download of the BLE C++ libraries found here resolves the issue.

[rickAllDev]

Just got back to this and updated. Compiled fine.

I'm not overly concerned with this type of issue personally - I'm not trying to stay on the cutting edge of espidf releases unless there is a have-to-have. So, I'll keep trying stuff out and let you know when I find issues. Adding mqtt and I2C now so I'm sure you'll hear from me.

fyi - I still have the original issue as stated above. I'll do more digging tomorrow and try to figure out how my code structure differs from your simple example and hopefully shed some light

[nkolban]

@rweller59 Thank you sir. I'm here to assist as best I can. I'm not going away from this project any time soon.

[rickAllDev]

so, here is what I have found.
I have a class call serviceWIFI with a method call wifiScan(). I created a serviceWIFI obect in main and call wifiScan.
in main:
serviceWIFI serviceWifi;
serviceWifi.wifiScan();

In the serviceWIFI class, I create WiFi wifi_debug and call wifi_debug.scan

• if I declare wifi_debug INSIDE of wifiScan(), things work fine
• if I declare wifi_debug OUTSIDE of wifiScan so that it is available class wide, program hangs at the statement listed in my original post up top

[Philius]

In make menuconfig:
Did you set FreeRTOS->"Enable FreeRTOS static allocation API"?

[rickAllDev]

I had not. Just tried it - clean, build. Didn't make a difference. Stopped at same spot

[nkolban]

@Philius Thats a new one on me. Do you know the semantics of that flag?

@rweller59 Weekend is coming. I work 9-5 Mon/Fri but the weekends give me more time to work on ESP32. Please believe that your ticket is first up.

I believe you have given me enough of a description that I can picture your code in my mind and will try and build a recreate from that. Just to be clear, I believe you are not using Arduino but are instead using plain ESP-IDF.

[rickAllDev]

That is correct. Eclipse c++ and ESPIDF. I appreciate you taking a look at it. I've got plenty of other things to work on in the mean time.