fix #125 - multiple typo fixes, etc in Commands-Telemetry.txt

Subsystems/Commands-Telemetry.md

@@ -0,0 +1,102 @@
+# Commands and Telemetry:
+
+## Telemetry ( tlmGUI/ directory ):
+Telemetry is sent from the running cFE/CFS as CCSDS telemetry packets encapsulated in 
+UDP/IP packets. The `enable telemetry` command tells the TO_LAB application to start 
+sending packets to a UDP port (port #1234 by default) on the `localhost` or a specified IP. 
+
+Start the telemetry system using the Ground System's main window.
+
+Buttons are available for individual telemetry pages. 
+
+New pages can be added by adding to the `telemetry-pages.txt` text file. 
+
+The format is not very forgiving, and must be:
+Description, Name of the Python class, Telemetry Message ID, packet definition file
+
+Also, a corresponding telemetry packet definition file must be added.
+
+For example: `cfe-es-hk-tlm.txt` is for the cFE Executive Services housekeeping packet. 
+That file contains the information needed to decode and display each data
+field of the packet. This is comma-delimited text, and has no error checking. 
+
+### The fields are:
+
+1. Field Description -- This is displayed on the GUI telemetry page
+
+2. Byte offset in packet -- This is the starting byte for the data field
+
+3. Length of data field in packet -- For integer types it must be 1, 2, or 4
+                              For strings, the number of characters (such as 16)
+
+4. Python type -- Python type for the field
+* B = unsigned byte
+* H = unsigned 16-bit integer
+* I = unsigned 32-bit integer
+* s = String
+
+Notes: Floating point types are not supported yet, but are planned. Also the
+type should match the length from #3 above.
+
+See all of the types here:
+http://docs.python.org/3/library/struct.html#format-characters
+
+5. Display type -- This is how the data is displayed on the page
+                    Dec = Decimal
+                    Hex = Hexadecimal
+                    Enm = Enumerated Type ( see next four fields )
+                    Str = String
+
+6. Enumerated type 0 -- This string is displayed if the display type is Enm
+and the value is 0
+
+7. Enumerated type 1 -- This string is displayed if the display type is Enm
+and the value is 1
+
+8. Enumerated type 2 -- This string is displayed if the display type is Enm
+and the value is 2
+
+9. Enumerated type 3 -- This string is displayed if the display type is Enm
+and the value is 3
+
+### What needs to be done:
+
+1. Expand number of enumerated types
+
+2. Provide some sort of optional data transformation
+
+3. Implement floats
+
+4. Be able to record/graph data? May be beyond the scope of this. 
+
+# Commands (cmdGUI/ directory)
+
+This is a simple Python / QT based Command GUI for the cmdUtil utility. 
+It provides a list of "command pages" with a list of commands to send to a subsystem.
+
+Start the command system using the Ground System's main window.
+
+The dialogs were created in the QT designer program, and converted to Python classes
+using the "pyuic5" utility:
+
+```
+pyuic5 -o MyDialog.py MyDialog.ui
+```
+
+The list of pages along with the AppID and address for each page is defined in the
+file `command-pages.txt`.
+
+Each command page has a list of subsystem commands in the text files. For example, 
+ES is in `cfe-es-cmds.txt`.
+
+This first release of the program does not allow editing of the command parameters 
+in the GUI. This would be really helpful for on-the-fly commanding (when you 
+want to do something like delete an app, and specify the app name in a dialog.)
+
+There is the possibility to implement multiple command interfaces using
+the Python class parameter that is passed in. For example, a copy of
+`UdpCommands.py` could be made, which would allow the commands to be sent
+over an Xbee RF radio, or TCP connection.
+
+The subsystem commands `cfe-es-cmds.txt` are interface-agnostic, so
+they can be reused.