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Scan network manually, be sure the target network can be found;
Check if the wireless mode of AP is set to B mode or B/G mixed mode.
2
、
Network configuration parameters of the AP is not correct
Check the configuration of WLAN module, ensure channel, BSSID, SSID, and
encryption setting is the same as the setting of AP.
3
、
If Link Layer data format is TCP, incorrect network parameters related to service can also
cause connection failure.
Check that MAC address of server, IP address of device, IP address of server and
service port setting are valid and correct. Please note, MAC address of server refers to
the physical address of the network card in the computer which the server software
runs. IP address of server refers to the IP address of the computer which the server
software runs in. Service port refers to the service port set in server software. IP
address of device refers to the IP address set for WLAN module. It must be in the same
sub network as the server.
.
Question: Why is my secret key always being incorrect?
The representation of the key in client software of this system may be different from that of your
AP. If so, format conversion is needed. Here is an example of the format conversion for a 64-
bit WEP key.
If the key of AP uses hexadecimal format
Suppose the key of AP is 10 hexadecimal numbers: 1234567890. Then after conversion the
key is represented as 5 hexadecimal numbers: 0x12, 0x34, 0x56, 0x78, 0x90.
If the key of AP uses ASCII format
Suppose the key of AP is 5 ASCII letters
：
abcde. Then after conversion the key is represented
as 5 hexadecimal numbers
：
0x61, 0x62, 0x63, 0x64, 0x65
（
Please refer to the normal ACSII character set for the hexadecimal representation of ASCII
characters. Common letters and numbers are represented as follows. The hexadecimal number
for letter ‘A’ is 0x41, ‘B’ is 0x42, etc. The hexadecimal number for letter ‘a’ is 0x61, ‘b’ is 0x62
etc. The hexadecimal number for character ‘0’ is 0x30, ‘1’ is 0x31 etc.
）
Question: Why does connection failure or quick disconnection after successful
connection happen when the TCP format is used?
TCP connection is a virtual connection. If the network connection disconnects abnormally, such
as power-off or manual reset, then the connection between the WLAN module and the server
cannot be cleared. This causes failure in reconnection to the server. The method to resolve this
problem is as follow.
Restart the server software;
Set different service port.
Question: Why can not the server receive any data?
