Setting WEP Mode and Key
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The mode can be either DISABLED, WEP64, or WEP128. WEP key is entered as a HEX string, not ASCII string. Each character in a string represents one HEX digit: 0..9 or A..F (a..f). The key has a fixed length: 10 HEX digits for WEP-64 or 26 HEX digits for WEP-128. If your key is too short it will be padded with zeroes. If the key is too long it will be truncated.
Here is the code example that sets the Wi-Fi to WEP128 mode:
Wi-Fi devices routinely define four WEP keys, but Tibbo hardware only uses a single key (key 1).
Note that the WEP mode and key can't be changed while the Wi-Fi interface is in the associated state (wln.associationstate= 1- PL_WLN_ASSOCIATED) or is running its own network (wln.associationstate= 2- PL_WLN_OWN_NETWORK).