4G Cellular Modem Support automatic identification of Modbus RTU/TCP protocol

Adaptive Modbus RTU/TCP protocol, the data format replied by the ZHC4012 is consistent with the data format sent by the cloud.

Support heartbeat package, custom registration Settings and remote selection of registration package mode.

TCP CLient communication

The serial server initiates a TCP connection to the server actively. If the connection fails, the connection is repeated
repeatedly until it succeeds. If the connection is completed, the server and serial device can carry out two-way transparent data
transmission.

HTTP CLient communication

Support serial port data to be transmitted to the specified server by HTTP.