chegewara, thank you for a reply! I tried to register the events: ESP_BT_GAP_AUTH_CMPL_EVT ESP_BT_GAP_PIN_REQ_EVT ESP_BT_GAP_KEY_REQ_EVT ESP_BT_GAP_KEY_NOTIF_EVT but without success. I don't received any message. Here is my scrap of code: void gap_callback(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_...

Hello, I was trying to connect ESP32 with OBD II adapter - ELM327 over bluetooth. I tried various options and generally, ELM 327 is receiving my messages, but don't answer them. I tried to communicate ESP32 with Android phone without password and BT Serial communication works properly. But in my pri...