Starts the process's Pigeon session. The session is a fact of the process
(what lets the public flush send its batches), not an upload: the first upload
of a recorded process is a batch of events, so none goes out here, and the
first batch the process sends is the app's first — it asks for the identity and echoes the checksums
the device holds — and its answer is read like any other.
Starts the process's Pigeon session. The session is a fact of the process (what lets the public flush send its batches), not an upload: the first upload of a recorded process is a batch of events, so none goes out here, and the first batch the process sends is the app's first — it asks for the identity and echoes the checksums the device holds — and its answer is read like any other.