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Lossless transport of parameter values that don't fit the PARAM_VALUE float field, via extended_type/extended_data extension fields and MAV_PARAM_TYPE_EXTENDED. int32 is the first encoding; the typed container is designed to later carry types the parameter protocol has never supported, such as int64 and short strings. Replaces the RFC 0017 parameter-encoding proposal (PR mavlink#18).
Replace the extended int32 proposal with explicit raw 32-bit types and signed/unsigned 64-bit extensions. Document support masks, shared-channel compatibility, raw NaN preservation and the reference implementation.
Specify REAL64 and a 128-byte custom container, negotiated asynchronous write progress, and terminal write failures. Document migration, unsupported catalog entries and the limits of value-based acknowledgement correlation.
MAVFTP supports parameter writes and individual reads. Describe this proposal as improving PARAM_* encoding alongside MAVFTP, and remove the incorrect limitations from the motivation and alternatives.
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Extend the existing parameter protocol to preserve full-width integers and carry the values and asynchronous write status needed to replace PARAM_EXT. This builds on the explicit bytewise types and requester opt-in proposed in #18.
The RFC specifies:
Related work: