User Manual
HF-LPB200 Low Power WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
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3.3. UART Frame Scheme
HF-LPB200 support UART free-frame function. Module will check the intervals between any two bytes
when reciving UART data. If this interval time exceeds defined value (50ms default), HF-LPB200 will
think it as the end of one frame and transfer this free-frame to WiFi port, or HF-LPB200 will receive
UART data untill 1400 bytes, then transfer 1400 bytes frame to WiFi port.
HF-LPB200‟s default interval time is 50ms. User can also set this interval to fast (10ms) through AT
command. But user have to consider if user MCU can send UART data with 10ms interval ,or the
UART data may be divide as fragment.
Through AT command: AT+UARTTE=fash/normal, user can set the interval time: fast (10ms) and
normal (50ms).
3.4. Encryption
Encryption is a method of scrambling a message that makes it unreadable to unwanted parties, adding
a degree of secure communications. There are different protocols for providing encryption, and the HF-
LPB200 module supports following:
WEP
WPA-PSK/TKIP
WPA-PSK/AES
WPA2-PSK/TKIP
WPA2-PSK/AES
3.5. Multi-TCP Link Connection
When HF-LPB200 module configured as TCP Server, it supports Multi-TCP link connection, and
maximum eight TCP clients permit to connect to HF-LPB200 module. User can realize multi-TCP link
connection at each work mode.
Multi-TCP link connection will work as following structure:
Upstream:
All dates from different TCP connection or client will be transmitted to the serial port as a sequence.
Downstream:
All data from serial port (user) will be duplicate and broadcast to every TCP connection or client.
Detailed multi-TCP link data transmition structure as following figure: