This command sets the 128-bit WEP key, where is EXACTLY 26 ASCII chars (13 bytes) in hex without the preceding 0x. Hex digits greater than 9 can be either upper or lower case. If you are using WPA or WPA2, enter a pass phrase with the set wlan passphase command.
Default: Not applicable
Example: set wlan key 112233445566778899AABBCCDD // Sets the passkey
NOTE: The module only supports open mode, 128-bit keys for WEP. WEP-128 shared mode is not supported because it is easily compromised and has been deprecated from the WiFi standards