Make MQTT_POLL_READ_TIMEOUT_MS configurable through menuconfig/sdkconfig (IDFGH-9196)

[ItayDumayVayyar]

Hey, I have implemented my own MQTT outbox for storing persistent messages in NVS. But I encountered a problem.
In esp_mqtt_task() the main logic is to ask the outbox for an item, transmit it, and then poll read for a potential ACK.

esp-mqtt/mqtt_client.c

Lines 1562 to 1568 in bb9c8af

	MQTT_API_UNLOCK(client);
	if (MQTT_STATE_CONNECTED == client->state) {
	if (esp_transport_poll_read(client->transport, MQTT_POLL_READ_TIMEOUT_MS) < 0) {
	ESP_LOGE(TAG, "Poll read error: %d, aborting connection", errno);
	esp_mqtt_abort_connection(client);
	}
	}

It appears that esp_transport_poll_read() is utilized with a fixed value for MQTT_POLL_READ_TIMEOUT_MS, currently set at 1 second. This means that using esp_mqtt_client_enqueue() would result in a slow message rate due to the dependency on the timeout period or receipt of an ACK before requesting the next message from the outbox.

[euripedesrocha]

Hi @ItayDumayVayyar, thanks for the suggestion. I'm working on this feature, it should be available soon.

[ItayDumayVayyar]

Hi @ItayDumayVayyar, thanks for the suggestion. I'm working on this feature, it should be available soon.

Great, thanks! Can you estimate in what ESP-IDF version this change will be included?