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Sends an Signal to your MQTT-Broker if a letter has arrived.

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Kaiserdragon2/Mailbox-monitoring

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Mailbox monitoring

On startup the application connects to the configured wlan access point. After that it connects to the specified MQTT-Broker and publishes a message. Then the ESP32 enters deepsleep. If GPIO 2 or GPIO 4 get an High signal the ESP32 wakes up from deepsleep and sends a message to an MQTT-Broker. Which message is send depends on the GPIO that triggers the wakeup process.

Hardware

Connect a button and a pulldown resistor to each of the two GPIOs.

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