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To add a new interface create a new file in this directory.
The file name should be <interface number>_<interface name>.def
The interface number should be padded to three digits to aid sorting.
New interfaces should use the next free interface code rather than
filling in gaps. This is to avoid confusion with old removed interfaces.
In the file you should have:
* a description block that contains a description of the interface
for the documentation
* a set of message blocks that define the interfaces messages
these are structured as
message { TYPE, SUBTYPE, SUBTYPE_CODE, DATA_TYPE };
* the data types for your interface in standard C code
The best bet is to have a look at some of the other interfaces and
copy what they have done
When modifying an interface try to avoid renumbering the subtype codes.
If you remove a subtype just leave a gap, this will aid in version
compatibility.
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