Update README.md

Disable conversion function when not building for ESP8266

Author: rjwats

README.md

@@ -2,7 +2,9 @@
 
 A simple, extensible framework for getting up and running with the ESP8266/ESP32 microchip and a react front end.
 
-Designed to work with the PlatformIO IDE with limited setup.
+Designed to work with the PlatformIO IDE with limited setup. 
+
+This project supports ESP8266 and ESP32 devices, see build instruction below for more details.
 
 ## Why I made this project
 
@@ -73,6 +75,30 @@ The endpoint root path can be found in Endpoint.js (./interface/src/constants/).
 
 CORS can be enabled on the back end by uncommenting the -D ENABLE_CORS build flag in platformio.ini and re-deploying.
 
+## Building for different devices
+
+This project supports ESP8266 and ESP32 platforms however your target device will need at least a 1MB flash chip to support OTA programming.
+
+By default this project is configured to build for the esp12e device. This is an esp8266 device with 4MB of flash. The following config in platformio.ini configures the build:
+
+```
+[env:esp12e]
+platform = espressif8266
+board = esp12e
+```
+
+If you want to build for an ESP32 device, all you need to do is re-configure playformio.ini with your devices settings:
+
+```
+[env:node32s]
+platform = espressif32
+board = node32s
+```
+
+Microcontroller	ESP8266
+Frequency	80MHz
+Flash	4MBl
+
 ## Configuration & Deployment
 
 Standard configuration settings, such as build flags, libraries and device configuration can be found in platformio.ini. See the [PlatformIO docs](http://docs.platformio.org/en/latest/projectconf.html) for full details on what you can do with this.

src/WiFiScanner.cpp

@@ -40,6 +40,7 @@ void WiFiScanner::listNetworks(AsyncWebServerRequest *request) {
   }
 }
 
+#if defined(ESP8266)
 /*
  * Convert encryption type to standard used by ESP32 rather than the translated form which the esp8266 libaries expose.
  * 
@@ -60,3 +61,4 @@ uint8_t WiFiScanner::convertEncryptionType(uint8_t encryptionType){
   }
   return -1;
 }
+#endif