ESP32 DevKit C v4 - Disconnected/Error at command AT+MQTTSUB to Thingsboard

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I use the board \'ESP32 NodeMCU DevKit C v4\' and I flashed it using the following firmware \'ESP32-WROOM-32_AT_Bin_V2.1.0.0\' (http://download.espressif.com/esp_at/firmware