Fix for GPIO0 button on Huzzah32

There there a few issues:
 - The button GPIO was configured incorrectly
 - The default random seed channel is 0, so that clashed with the the button
 - The default state was incorrect for whena button is triggered low

Fixes #34

Author: jeremypoulter

platformio.ini

@@ -237,8 +237,10 @@ src_build_flags =
   ${common.version}.dev
   ${common.src_build_flags}
   ${common.src_build_flags_esp32}
-  -DWIFI_LED=LED_BUILTIN
-  -DWIFI_BUTTON=LED_BUILTIN
+  -DWIFI_LED=13
+  -DWIFI_LED_ON_STATE=HIGH
+  -DWIFI_BUTTON=0
+  -DWIFI_BUTTON_PRESSED_STATE=LOW
   -DRAPI_PORT=Serial
   -DDEBUG_PORT=Serial2
   -DSERIAL_RX_PULLUP_PIN=3

src/emonesp.h

@@ -64,8 +64,14 @@
 #define WIFI_CLIENT_RETRY_TIMEOUT (5 * 60 * 1000)
 #endif
 
+// Used to change the ADC channel used for seeding the rndom number generator
+// Should be set to an unconnected pin
 #ifndef RANDOM_SEED_CHANNEL
+#if WIFI_BUTTON != 0 && (!defined(WIFI_LED) || WIFI_LED != 0)
 #define RANDOM_SEED_CHANNEL 0
+#else
+#define RANDOM_SEED_CHANNEL 1
+#endif
 #endif
 
 #ifdef ONBOARD_LEDS

src/net_manager.cpp

@@ -46,7 +46,7 @@ int wifiLedState = !WIFI_LED_ON_STATE;
 unsigned long wifiLedTimeOut = millis();
 #endif
 
-int wifiButtonState = HIGH;
+int wifiButtonState = !WIFI_BUTTON_PRESSED_STATE;
 unsigned long wifiButtonTimeOut = millis();
 bool apMessage = false;