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docs/menu_radios.md

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@@ -14,7 +14,7 @@ ESP-Now is a 2.4GHz protocol that is built into the internal ESP32 microcontroll
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Additionally, ESP-Now supports point-to-multipoint transmissions. This means a Base can transmit to multiple Rovers simultaneously.
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ESP-Now is a free radio included in every RTK product, and works well, but it has a few limitations:
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ESP-Now is a free radio included in every RTK product and works well, but it has a few limitations:
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1. Limited use with Bluetooth SPP. The ESP32 is capable of [simultaneously transmitting](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/coexist.html) ESP-Now and Bluetooth LE, but not classic Bluetooth SPP. Unfortunately, SPP (Serial Port Profile) is the most common method for moving data between a GNSS receiver and the GIS software. Because of this, using ESP-Now while connecting to the RTK product using Bluetooth SPP is not stable. SparkFun RTK products support Bluetooth LE and ESP-Now works flawlessly with Bluetooth LE. There are a few GIS applications that support Bluetooth LE including SW Maps. Another option is to use ESP-Now for the Base-Rover link and a GIS app such as [Vespucci](gis_software.md#vespucci) or [QGIS](gis_software.md#qgis) that can obtain PVT data over WiFi (TCP) rather than use Bluetooth to gather the NMEA data from the RTK device.
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All devices must be on the same WiFi channel to communicate over ESP-Now. Option **4 - Current channel** shows the current channel and allows a user to select a new one. Allowable channel numbers are 1 to 14. By default, devices will communicate on Channel 1. A user may select any channel they prefer.
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**Note:** ESP-Now can operate alongside WiFi but the user should be aware of the channel numbers of the devices. When a device connects to a WiFi network, the ESP-Now channel number may be altered by the WiFi radio so that the RTK device can communicate with the WiFi Access Point.
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**Note:** ESP-Now can operate at the same time as WiFi but the user should be aware of the channel numbers of the devices. When a device connects to a WiFi network, the ESP-Now channel number may be altered by the WiFi radio so that the RTK device can communicate with the WiFi Access Point.
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Using a single device to communicate corrections to multiple devices (no WiFi involved) is the most common use case for ESP-Now.
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Using ESP-Now with a single device on WiFi is possible. Take the example of a Base that needs to communicate corrections over ESP-Now and will also be pushing the corrections to a Caster over NTRIP using WiFi: The Base is started, WiFi is activated, and the channel is overwritten to 9 (for example) when the device connects to the Access Point. All rovers in the area who wish to obtain corrections over ESP-Now also need to have their channels set to 9.
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Using WiFi on one of the devices in an ESP-Now network is possible. Take the example of a Base that needs to communicate corrections over ESP-Now and will also be pushing the corrections to a Caster over NTRIP using WiFi: The Base is started, WiFi is activated, and the channel is overwritten to 9 (for example) when the device connects to the Access Point. All rovers in the area who wish to obtain corrections over ESP-Now also need to have their channels set to 9.
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Using multiple devices on *different* WiFi networks, while attempting to use ESP-Now, is likely impossible because the device's channel numbers will be modified to match the different channels of the Access Points.
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Using multiple devices on *different* WiFi networks, while attempting to use them in an ESP-Now network, is likely impossible because the device's channel numbers will be modified to match the different channels of the Access Points.

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