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@@ -94,6 +94,11 @@ with this command format:
**frequency** - (optional, defaults to 0) The frequency in Hz to send this
request. To send a single request, set this to 0 or leave it out.
+The `bus+id+mode+pid` key is unique, so if you send a create request with that
+key twice, it'll overwrite the existing one (i.e. it will change the frequency,
+the only other parameter). To cancel a recurring request, send this command with
+the frequency set to 0.
+
TODO it'd be nice to have the OBD-II PIDs built in, with the proper conversion
functions - that may need a different output format