6.9.4

Updated README.md with the information about QP/Spy support

Author: quantum-leaps

README.md

@@ -116,11 +116,36 @@ it is re-generated by the QM modeling tool.
 
 
 ----
-# Example Documentation
+## Example Documentation
 
 Each example model has documentation, which you can view in the QM tool.
 The model documentation shows in the Property Editor when the model item
 is active.
+
+----
+# QP/Spy Software Tracing Support
+
+The qpcpp_arm-cm library now supports the
+[QP/Spy software tracing](https://www.state-machine.com/software-tracing).
+This feature is also demonstrated in the qpcpp examples (with the BSP).
+
+To activate the software tracing, you would need to un-comment the `QS_ON`
+macro at the top of bsp.cpp source file.
+
+> **NOTE:** Because the QP/Spy output is binary, you cannot watch it
+with a standard serial terminal. Instead, you need to use the
+[QSPY host utility](https://www.state-machine.com/qtools/qspy.html). 
+
+----
+## QView Demonstration
+Once QP/Spy tracing is enabled, this communication with the target system
+can be used to for
+[QView visualization and monitoring](https://www.state-machine.com/qtools/qview.html)
+
+The `dpp_bsp-sam` example demonstrates the [QView monitoring]. To see this
+feture, you need to upload the dpp_bsp-sam code to the Arduino UNO board and
+then you need to launch QView, from the sub-directory `qview` in the
+`dpp_bsp-sam` example.
 
 
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