Reset SIM868 modem

[elAlexOmDiWo]

Good day.
Good evening.
Can anyone suggest how can I reset SIM868 when using this library?
So far, I have a permanent HardFault.

Part of FreeRTOS task -

  if( event & LVGSM_RESET ) {                     // Request to reset library and modem
    ulTaskNotifyValueClear( NULL, LVGSM_RESET ); 

    for( uint8_t i = 0; i < 10; i++ ) {  
      lwgsm_mqtt_client_api_delete( mqtt_client );
      mqtt_client = NULL;
      lwgsm_network_request_detach();
      
      controlGprsRxUart( GPRS_EVT_CMD_STOP );                 // Stop RX task
      
      PWRKEY_LOW();
      vTaskDelay( 1750 );
      PWRKEY_HI();
      vTaskDelay( 3000 );

      controlGprsRxUart( GPRS_EVT_CMD_START );                // Start RX task
      
      if( lwgsmOK == lwgsm_reset_with_delay( 1000, NULL, NULL, 1 )) {
        break;
      }      
    }
  }

[MaJerle]

Where is HF triggered?

[elAlexOmDiWo]

HF ? Gps module ? As in example -

lwgsmr_t lwgsm_ll_init(lwgsm_ll_t* ll) {
static uint8_t memory[0x1000];
lwgsm_mem_region_t mem_regions[] = {
{ memory, sizeof(memory) }
};
if (!initialized) {
lwgsm_mem_assignmemory(mem_regions, LWGSM_ARRAYSIZE( mem_regions )); /* Assign memory for allocations /
}
if (!initialized) {
ll->send_fn = send_data; / Set callback function to send data /
ll->reset_fn = reset_device; / Set callback for hardware reset */
}
initialized = 1;
return lwgsmOK;
}

And -
static uint8_t reset_device( uint8_t state ) {
if (state) { /* Activate reset line */
PWRKEY_LOW();
initialized = 0;
}
else {
PWRKEY_HI();
}
return 1;
}

In the event modem only switch off ( before restart as in SIM868_Series_Hardware_Design_V1.07 )

[MaJerle]

What code triggers hard fault?

[elAlexOmDiWo]

after this -
lwgsm_network_request_detach();

If I remove it, the library does not start because of -
network_counter! = 0 (lwgsm_network_api.c).
Most likely I'm wrong somewhere.
How would you implement a function of cold start library with modem ?