Update docs for v3.4

Author: nseidle

docs/configure_pointperfect.md

@@ -4,17 +4,17 @@ Surveyor: ![Feature Not Supported](img/RedDot.png) / Express: ![Feature Not Supp
 
 **Note:** This section only applies to RTK Facet *L-Band* products. Regular RTK Facet, Surveyor, Express, and Express Plus products do not have L-Band antennas or receivers built-in.
 
-![PointPerfect Menu showing Home WiFi credentials](img/SparkFun%20RTK%20PointPerfect%20Config.png)
+![PointPerfect Menu](img/SparkFun%20RTK%20PointPerfect%20Config.png)
 
 *Configuring PointPerfect settings over WiFi*
 
-![PointPerfect Menu showing Home WiFi credentials](img/SparkFun%20RTK%20PointPerfect%20Menu.png)
+![PointPerfect Menu](img/SparkFun%20RTK%20PointPerfect%20Menu.png)
 
 *Configuring PointPerfect settings over serial*
 
 *RTK Facet L-Band* products are equipped with a special antenna and extra receiver to decrypt the L-Band corrections using the PointPerfect service from u-blox. The PointPerfect sub-menu allows a user to enter their 'Home' WiFi settings. This WiFi SSID and password are used to regularly obtain the needed decryption keys from u-blox. This is normally your home WiFi or other accessible WiFi.
 
-PointPerfect L-Band decryption keys are valid for a maximum of 56 days. During that time, the RTK Facet L-Band can operate normally without the need for WiFi access. However, when the keys are set to expire in 28 days or less, the RTK Facet L-Band will attempt to log in to the 'Home' WiFi at each power on. If WiFi is not available, it will continue normal operation. If the keys fully expire, the device will continue to receive the L-Band signal but will be unable to decrypt the signal, disabling high precision GNSS. The RTK Facet L-Band will continue to have extraordinary accuracy (we've seen better than 0.15m HPA) but not the centimeter-level accuracy that comes with RTK.
+PointPerfect L-Band decryption keys are valid for a maximum of 56 days. During that time, the RTK Facet L-Band can operate normally without the need for WiFi access. However, when the keys are set to expire in 28 days or less, the RTK Facet L-Band will attempt to log in to WiFi at each power on. If WiFi is not available, it will continue normal operation. If the keys fully expire, the device will continue to receive the L-Band signal but will be unable to decrypt the signal, disabling high precision GNSS. The RTK Facet L-Band will continue to have extraordinary accuracy (we've seen better than 0.15m HPA) but not the centimeter-level accuracy that comes with RTK.
 
 **Note:** The RTK Facet L-Band is capable of receiving RTCM corrections over traditional means including NTRIP data over Bluetooth or a serial radio. But the real point of L-Band and PointPerfect is that you can be *anywhere*, without cellular or radio cover, and still enjoy millimeter accuracy.
 
@@ -30,21 +30,19 @@ The unit will display various messages to aid the user in obtaining keys as need
 
 Upon successful reception and decryption of PointPerfect corrections, the satellite dish icon will increase to a three-pronged icon. As the unit's fix increases the cross-hair will indicate a basic 3D solution, a double blinking cross-hair will indicate a floating RTK solution, and a solid double cross-hair will indicate a fixed RTK solution.
 
-![PointPerfect Menu showing Home WiFi credentials](img/SparkFun%20RTK%20PointPerfect%20Menu.png)
+![PointPerfect Menu](img/SparkFun%20RTK%20PointPerfect%20Menu.png)
 
-*PointPerfect Menu showing Home WiFi credentials*
-
-In addition to allowing the entry of WiFi credentials, the PointPerfect Menu will display the Device ID. This is needed when a SparkFun RTK Facet L-Band product needs to be added to the PointPerfect system. This is normally taken care of when you purchase the L-Band unit with PointPerfect service added, but for customers who did not purchase the service and want to add it at a later date, this Device ID is what customer service needs.
+*PointPerfect Menu*
 
 The *Days until keys expire* inform the user how many days the unit has until it needs to connect to WiFi to obtain new keys.
 
 * Option '1' disables the use of PointPerfect corrections.
 
-* Option '2' or '3' enables the entry of WiFi credentials used for obtaining new keys from the PointPerfect API.
+* Option '2' disables the automatic attempts at WiFi connections when key expiry is less than 28 days.
 
-* Option '4' disables the automatic attempts at WiFi connections when key expiry is less than 28 days.
+* Option '3' will trigger an immediate attempt to connect over WiFi and update the keys.
 
-* Option '5' will trigger an immediate attempt to connect over WiFi and update the keys.
+* Option '4' will display the Device ID. This is needed when a SparkFun RTK Facet L-Band product needs to be added to the PointPerfect system. This is normally taken care of when you purchase the L-Band unit with PointPerfect service added, but for customers who wish to extend their subscription beyond the initial year, or did not purchase the service and want to add it at a later date, this Device ID is what customer service needs.
 
 * Option 'k' will bring up the Manual Key Entry menu.
 

docs/img/SparkFun RTK PointPerfect Config.png

@@ -48,3 +48,8 @@ Configuring over WiFi allows the device to be configured from any desktop comput
 
 When the device enters WiFi config mode it will display the WiFi network it is connected to as well as its assigned IP address.
 
+## MDNS
+
+![Access using rtk.local](img/SparkFun%20RTK%20WiFi%20MDNS.png)
+
+Multicast DNS or MDNS allows the RTK device to be discovered over wireless networks without needing to know the IP. For example, when MDNS is enabled, simply type 'rtk.local' into a browser to connect to the RTK Config page. This feature works both for 'WiFi Access Point' or direct WiFi config. Note: When using WiFi config, you must be on the same subdomain (in other words, the same WiFi or Ethernet network) as the RTK device.