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Protocol Notes

Rivet uses Canon Wi-Fi PTP/IP and Canon EOS Live View operations.

PTP/IP

The camera accepts two TCP channels on port 15740:

  • command channel
  • event channel

The event channel is initialized with the command channel connection number.

MTP Session

Rivet opens an MTP session over the command channel, then requests device information before enabling Live View. This confirms the command transport is ready for Canon EOS operations.

Canon EOS Live View

Rivet enables Canon Live View with the verified T100 transition:

  1. Set remote mode to 1.
  2. Set event mode to 1.
  3. Read EVF mode.
  4. Enable EVF mode when disabled.
  5. Read EVF output device.
  6. Write EVF output device as currentOutput | 8.
  7. Request Live View data with GetViewFinderData (0x9153).

0xA102 is treated as a transient object-not-ready state during Live View startup. Rivet polls Canon events and retries frame retrieval.

Frame Validation

Only marker-valid JPEG payloads are published to HTTP clients. Malformed Canon viewfinder payloads are discarded before they reach OBS.

Verified Output

The Canon EOS Rebel T100 / EOS 4000D produces 480x320 Live View JPEG frames through this path.