User's Manual

HF-A21-SMT Embedded WiFi Module User Manual

Shanghai High-Flying Electronics Technology Co., Ltd

www.hi-flying.com

3.3.2. Remote Management Application

Figure 35. Remote Management Application

For this remote management application, HF-A21-SMT works as STA mode and connects to

Internet through wireless AP. Module configured as TCP Client and communicates with remote

TCP server at Internet. Module‟s serial port connects to user device.

So, user device‟s data or sampling information can send to remote TCP server for storage or

processing. Also remote TCP server can send command to control and manage the user device

through the wireless network.

3.3.3. Transparent Serial Port Application

For this transparent serial port application, two HF-A21-SMT modules connect as below figures to

build up a transparent serial port connection.

Figure 36. Transparent Serial Port Application

For left side HF-A21-SMT module, configured as AP mode and use default SSID and IP address,

network protocol configured as TCP/Server mode, and protocol port ID: 8899.

For right side HF-A21-SMT module, configured as STA mode and setting the same SSID （”HF-

A11x_AP” for this example）with left side HF-A21-SMT module, enable DHCP network and

network protocol configured as TCP/Client mode, protocol port ID: 8899. Target IP address part

setting the same IP address with left side HF-A21-SMT module (“10.10.100.254” for this

example).