we now always listen before transmit - even if we have just completed a packet

src/OSTimer.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <Arduino.h>
+
+typedef void (*PendableFunction)(void *pvParameter1, uint32_t ulParameter2);
+
+/**
+ * Schedule a callback to run.  The callback must _not_ block, though it is called from regular thread level (not ISR)
+ *
+ * @return true if successful, false if the timer fifo is too full.
+ */
+inline bool scheduleCallback(PendableFunction callback, void *param1, uint32_t param2, uint32_t delayMsec)
+{
+    return xTimerPendFunctionCall(callback, param1, param2, pdMS_TO_TICKS(delayMsec));
+}