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• Connectors (T1 and T2) for connecting two DS18B20 digital thermistors with automatic detection. Reading temperature every 20 seconds and sending to MQTT with topic /T1-Celsius
• Ethernet connection using RJ45 connector with IP address retrieval from DHCP server. Static IP address setting is not implemented
• http web server publishing two pages
  • mqtt-wall, which is a web MQTT client, for displaying messages that the device has sent to the MQTT broker
  • SETUP page for configuring the device contains settings
    
    • MQTT topic
    • Device ID
    • RS485 (USB-C) BAUDRATE
    • MQTT broker IP
    • MQTT broker PORT
    • websocet MQTT PORT
    • MQTT Login
    • MQTT Password
• Saving device settings to internal eeprom
• OTA update - allows you to update the device firmware via Ethernet via the web interface. Available at [IP]:82/update, or from the link on the main page of mqtt-wall
• MQTT client for sending and receiving messages from the broker
• Measuring POE voltage and sending the value to MQTT when it changes
• Watchdog timer, triggers a device restart if the firmware stops for longer than 60s
• detect USB-C plug and publish to MQTT with topic /USBdetect
• RS485-MQTT proxy - received RS485 data forward to MQTT with topic /RS485_RX