Changed test to use new 250kbps mode

tests/pingpair_test/pingpair_test.pde

@@ -173,7 +173,7 @@ void setup(void)
   if (configuration=='2')
   {
     radio.setCRCLength(RF24_CRC_8);
-    radio.setDataRate(RF24_2MBPS);
+    radio.setDataRate(RF24_250KBPS);
     radio.setChannel(10);
   }
   else

tests/pingpair_test/runtests.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # Connect p6 to receiver, p4 to sender
+# WARNING: Test config 2 only works with PLUS units.
 
 jam p4 p6 || exit 1
 ./runtest.py /dev/tty.usbserial-A600eHIs 3 &