commit ce43f8419da3256bc6e8f9455613ad56344506b3
Author: James Devine <devine.jd@gmail.com>
Date:   Thu Sep 28 15:22:32 2017 +0200

diff --git a/ArduinoSerialEchoTest.ino b/ArduinoSerialEchoTest.ino
new file mode 100644
index 0000000..9c5a348
--- /dev/null
+++ b/ArduinoSerialEchoTest.ino
@@ -0,0 +1,21 @@
+//this can be used to test a uart connected GPS.
+
+void setup() {
+  // initialize both serial ports:
+  Serial.begin(9600);
+  Serial1.begin(9600);
+}
+
+void loop() {
+  // read from port 1, send to port 0:
+  if (Serial1.available()) {
+    int inByte = Serial1.read();
+    Serial.write(inByte); 
+  }
+  
+  // read from port 0, send to port 1:
+  if (Serial.available()) {
+    int inByte = Serial.read();
+    Serial1.write(inByte); 
+  }
+}
\ No newline at end of file