added support for ESP32 (untested)

include/WaterMeter.h

@@ -43,8 +43,6 @@
 #define MARCSTATE_RXTX_SWITCH      0x15
 #define MARCSTATE_TXFIFO_UNDERFLOW 0x16
 
-#define CC1101_GDO0 D2   // GDO0 input interrupt pin
-
 #define WRITE_BURST              0x40
 #define READ_SINGLE              0x80
 #define READ_BURST               0xC0

include/hwconfig.h

@@ -0,0 +1,33 @@
+#ifndef __HWCONFIG_H__
+#define __HWCONFIG_H__
+
+#if defined(ESP8266)
+// Attach CC1101 pins to ESP8266 SPI pins
+// VCC   => 3V3
+// GND   => GND
+// CSN   => D8
+// MOSI  => D7
+// MISO  => D6
+// SCK   => D5
+// GD0   => D2  A valid interrupt pin for your platform (defined below this)
+// GD2   => not connected 
+  #define CC1101_GDO0         D2   // GDO0 input interrupt pin
+  #define PIN_LED_BUILTIN     D4
+#elif defined(ESP32)
+// Attach CC1101 pins to ESP32 SPI pins
+// VCC   => 3V3
+// GND   => GND
+// CSN   => 4
+// MOSI  => 23
+// MISO  => 19
+// SCK   => 18
+// GD0   => 32  any valid interrupt pin for your platform will do
+// GD2   => not connected 
+
+// attach CC1101 pins to ESP32 SPI pins
+
+  #define CC1101_GDO0          32
+  #define PIN_LED_BUILTIN      2
+#endif
+
+#endif //__HWCONFIG_H__