Where can I call NimBLEDevice::init()?

[mauricego]

Hello,

if I call NimBLEDevice::init() directly inside the setup() function everything works.

But if I put NimBLEDevice::init() into a function in another file and call that function form my setup() I get the following error:

ESP_ERROR_CHECK failed: esp_err_t 0x101 (ESP_ERR_NO_MEM) at 0x40094dfc
file: ".pio/libdeps/az-delivery-devkit-v4/NimBLE-Arduino/src/NimBLEDevice.cpp" line 879
func: static void NimBLEDevice::init(const string&)
expression: esp_bt_controller_init(&bt_cfg)

abort() was called at PC 0x40094dff on core 1

Backtrace:0x40084029:0x3ffcd6400x40094e09:0x3ffcd660 0x4009a6e5:0x3ffcd680 0x40094dff:0x3ffcd700 0x400d869e:0x3ffcd720 0x400d5c92:0x3ffcd770 0x400d625f:0x3ffcd7d0 0x400d57a5:0x3ffcd840 0x400f923a:0x3ffcd870

Is it not possible to call NimBLEDevice::init() outside of setup()?

[h2zero]

You can call it anywhere you need. I suspect something is releasing the ble controller memory before init is called.

[mauricego]

Do you know in which kind of direction I should start looking to find out what could release the ble controller memory?

[chegewara]

I would say there is no heap to init bluetooth stack.
Thats true, you can call init() everywhere, but it is recommended to do it in setup() to make sure there is enough heap to init stack.

[mauricego]

Turns out is has nothing to do with NimBLE.

Before calling NimBLEDevice::init() i called the following function:

void createName() {
    uint8_t baseMac[6];
    // Get MAC address for WiFi station
    esp_read_mac(baseMac, ESP_MAC_WIFI_STA);
    // Write unique name into apName
    sprintf(apName, "LED-Strip-%02X%02X%02X%02X%02X%02X", baseMac[0], baseMac[1], baseMac[2], baseMac[3], baseMac[4],
            baseMac[5]);
}

I used this code before calling NimBLEDevice::init() to generate a unique name for my ESP32.

But somehow this function crashes the ESP with the error of my original post.

I will do some further testing because I don't understand why this happens at all.

Before using NimBLE I used the normal Bluetooth BLEDevice.h and had no problem with calling createName() before calling the Bluetooth init function.