There are lots of devices and gateways used in IoT Applications.
According to communication methods, there are:
• Cellular IoT Gateways;
• WiFi Devices IoT Gateway;
• BLE Devices IoT Gateway;
• Ethernet IoT Gateways.
• Lora IoT Gateways.
According to the requirements, also there're some IoT gateways with combination communication method, e.g.: Lora and Cellular IoT Gateway, Ethernet and Cellular IoT Gateway, etc.
IIoT Gateways: Modbus Gateways, Modbus TCP Gateways, MQTT Gateways, OPC Gateways
IIoT Gateway is the industrial internet of things gateway. includes lots of products, used for protocol convert. e.g.: Modbus Gateways, Modbus TCP Gateways, MQTT Gateways, OPC Gateways.
• Modbus Gateway: Convert Modbus RTU to other protocols, or convert other protocols to Modbus RTU;
• Modbus TCP Gateway: Convert Modbus RTU to Modbus TCP Protocols;
• MQTT Gateway: Convert other protocols to MQTT Protocol;
• OPC Gateways: Convert OPC DA to OPC UA, or convert Modbus RTU and other protocols to OPC UA.