MRP Compatibility and Limitations

Supported platforms

• .NET Framework 4.7.2 (desktop, including Mono hosts - validate independently)
• .NET 10

AppleTvControlLibrary.Mrp targets the same net472/net10.0 matrix as the Companion Link library, using the same Span<T>/Memory<T> polyfills and compiler-attribute shims so a single C# 13 codebase compiles on both targets with no #if branching in the protocol layer.

Transport

MRP is tunneled over AirPlay 2 only. The library does not implement:

• A raw-TCP MRP transport (retired; see archive/mrp-tcp-transport/README.md).
• AirPlay 2 media/audio/video streaming - only the MRP control channel is tunneled.
• Companion Link (HID input, touch, coarse volume/power control) - pair and connect to the Companion Link library separately for that functionality.

Hardware compatibility

This library has not been independently validated against real Apple TV hardware for MRP in the same breadth as the Companion Link library's 4K-model test matrix. Treat MRP-over-AirPlay support as validated primarily against the in-process fake device (tests/AppleTv.Mrp.FakeDevice) and the pairing integration tests in tests/AppleTv.Mrp.Tests, and please report any issues you hit against real hardware.

Protocol reference and correctness

AppleTvControlLibrary.Mrp is a from-scratch C# port of pyatv's MRP implementation (pyatv/protocols/mrp), including its protobuf message definitions. Protocol constants carry citation comments to the pyatv source file and line they were ported from. See ATTRIBUTIONS.md and THIRD-PARTY-NOTICES.txt for licensing details.