neu-implementierung. Funktioniert einigermaßen, interferiert aber mit anderen timer-basierten bibliotheken

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

examples/SendAndReceive/SendAndReceive.ino

@@ -27,9 +27,6 @@ void setup() {
   }
 }
 
-void messageReceived(String message){
-}
-
 void loop(){
   if (available485()){ // check if we have received anything
     Serial.print("messageReceived: ");
@@ -39,6 +36,10 @@ void loop(){
     count++;
     char msg[128];
     (message+count).toCharArray(msg,128);
-    send485(msg);
+    if (!send485(msg)){
+      Serial.print("Sending ");
+      Serial.print(msg);
+      Serial.println(" failed!");
+    }
   }
 }