Description IoT temperature sensor with RJ45 network interface; supports DHCP protocol; device parameters can be configured via web page; supports HTTP GET method to return temperature data in fixed JSON format; MQTT communication protocol version: supports DHCP and DNS, configurable MQTT server IP address, port, username, password, ClientID, TopIC, Message?, etc.; after configuring MQTT server parameters, it can actively connect to the server to periodically report collected temperature data; Modbus communication protocol version: supports DHCP, supports configuring TCP Server, TCP Client, and UDP. Server mode: Configurable Modbus address; HTTP communication protocol mode: Supports DHCP, allows configuration of server IP address, port, reporting interval, URL path, and HTTP messages. The device periodically and proactively connects to the server, sending messages via POST. Multiple power supply options: PoE power supply mode: Requires connection to a PoE switch, directly powered by the PoE switch; Switch-side power supply mode: A 220V transformer and splitter cable are connected to the switch, powering the device via a network cable (8-core cable required); Remote power supply mode: Requires a separate power supply. A power supply between 12V and 48V can be used. For long cables, a 48V power supply is required. The splitter cable is connected to the switch, powering the device via a network cable (8-core cable required); 12V power supply mode: Requires a separate 12V 1A DC power supply or a 12V 1A power adapter. The probe uses the DS18B20 temperature sensor chip. The measurement temperature range is -55°C to 125°C. The Fahrenheit equivalent is 67°F to 257°F. The accuracy is ±0.5°C within the range of -10°C to 85°C. Applications: 1. Suitable for temperature measurement and control in cold storage, grain silos, storage tanks, telecommunications rooms, power rooms, cable trays, etc. 2. Temperature measurement and control in confined spaces such as bearings, cylinder blocks, textile machinery, and air conditioners. 3. Automotive air conditioners, refrigerators, freezers, and medium- and low-temperature drying ovens. 4. Heat metering for heating/cooling pipelines, individual heat energy metering for central air conditioning systems, and temperature measurement and control in industrial applications.