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In the manual connection mode, users need to control connection and disconnection of
WLAN module through user command.
Encryption
2.4.
WLAN module supports three encryption modes: WEP, WPI, and CCMP, and the non encrypted
OPEN mode.
WEP
In the WEP encryption mode, user can set 4 sets of key, and choose one set as default key.
The length of the key can be 64 bit or 128 bit.
64 bit key: In addition to the 24 random bits, user needs to set the rest 40 bits, or 5 bytes.
128bit key: In addition to the 24 random bits, use needs to set the rest 104 bits, or 13 bytes.
WPI
In the encryption mode of WPI, user needs to set 32-byte key. Broadcast is achieved from AP
automatically. This encryption mode must be used with the AP designed by LinkSprite.
CCMP
In the encryption mode of WPI, user needs to set 16-byte key. Broadcast is achieved from AP
automatically. This encryption mode must be used with the AP designed by LinkSprite.
2.5. Data transmission
In a connection, WLAN module automatically transmits the payload data that it receives
between the user's serial (UART) port and the wireless port.
According to the user setting, the Data Link Layer of WLAN module can work in RAW, UDP or
TCP data formats.
2.5.1. RAW format
In the raw data format, user data is not encapsulated while it is transmitted in Data Link Layer.
Instead, it is directly packed into an 802.11 network frame and transmitted. In this format, WLAN
module uses the server's MAC address as the target address of the transmission.
The RAW data transmission model is as following:
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