[MVMA] Passive WiFi scan now in http://localnode:8080/help.html

[Chuck Gelm]

Passive WiFi scan now in Nightly Build and Help page.
Nightly build ID: 1095

http://localnode:8080/help.html

  * *WiFi **Scan* Displays a list of other 802.11 signals that your node
    can see.
  * The 802.11 signals may include Access Points, neighbor nodes, and
    other mesh networks (foreign ad-hoc networks).
  * WiFi Scan only finds devices on the same channel width as your node
    is configured to.
  * When installing at a new location, it is best practice to scan on 5,
    10, and 20MHz channels to find all 802.11 signals in range.
  * This information will help to pick a channel clear of other
    interference.
  * When multiple ad-hoc networks are visible (with different SSIDs or
    channels), the ID of each 802.11 ad-hoc *network* is displayed but
    not the individual nodes.
  * There is also an automatic scan mode, but running a Wifi Scan
    continuously is not recommended, particularly if the node is
    actively routing traffic.
  * The scan is passive, or only listens for other beacons through all
    channels, and risks loss of data on the assigned channel.
  * Wifi Scan does not transmit probes on every channel in passive mode,
    thus
    no risk of interfering with Radar stations on DFS channels, or other
    unintended transmissions.
  * Multiple attempts of Wifi Scan will be necessary to find all devices
    in range.


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