Added another test of a simpler calling pattern. No IRQ, no dynamic payload or ack packet.

tests/pingpair_blocking/runtests.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# Connect p6 to receiver, p4 to sender
+
+jam p4 p6 || exit 1
+./runtest.py /dev/tty.usbserial-A600eHIs 1 & 
+./runtest.py /dev/tty.usbserial-A40081RP 1 || ( kill `jobs -p` && exit 1 ) 
+kill `jobs -p`
+exit 0