Merge pull request #188 from OpenSprinkler/dev/latch32

Fw 2.1.9(9) adding support for OS Latch 3.2 and other feature improvements

Author: rayshobby

I2CRTC.cpp

@@ -39,6 +39,10 @@ I2CRTC::I2CRTC()
 	Wire.begin();
 }
 
+bool I2CRTC::exists() {
+	return (addr!=0);
+}
+
 bool I2CRTC::detect()
 {
 	addr = 0;

I2CRTC.h

@@ -24,6 +24,7 @@ class I2CRTC
 	static void read(tmElements_t &tm);
 	static void write(tmElements_t &tm);
 	static bool detect();
+	static bool exists();
 
 	private:
 	static uint8_t dec2bcd(uint8_t num);