added isValidAddress()

src/lib/ebus/symbol.cpp

@@ -187,3 +187,7 @@ bool isMaster(unsigned char addr) {
 	    && ((addrLo == 0x0) || (addrLo == 0x1) || (addrLo == 0x3) || (addrLo == 0x7) || (addrLo == 0xF));
 }
 
+bool isValidAddress(unsigned char addr, bool allowBroadcast) {
+	return addr != SYN && addr != ESC && (allowBroadcast == true || addr != BROADCAST);
+}
+

src/lib/ebus/symbol.h

@@ -135,4 +135,12 @@ private:
  */
 bool isMaster(unsigned char addr);
 
+/**
+ * Returns whether the address is a valid bus address.
+ * @param addr the address to check.
+ * @param allowBroadcast whether to also allow @a addr to be the broadcast address (default true).
+ * @return <code>true</code> if the specified address is a valid bus address.
+ */
+bool isValidAddress(unsigned char addr, bool allowBroadcast=true);
+
 #endif // LIBEBUS_SYMBOL_H_