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You should be able to retrieve the RSSI level if you install iw on your Edison. This package can be downloaded from AlexT's repo. In case you haven't it set up, you can find instructions on how to do it in Edison Package Repo Configuration Instructions. I installed the following packages:
Using the commands:
opkg install iw opkg install iw-dbg iw-dev iw-doc libiw-dbg libiw-dev libiw-doc libiw30
After installing this you will be able to check the RSSI level of the desired client with the command: iw wlan0 station get [DEVICE'S MAC ADDRESS]. This is my output:
Thanks for your answer. I didn't realize that there is an Edison iw package exists.