Function upload_stream 

pub(crate) async fn upload_stream(
    client: &Client,
    endpoint: &str,
    fields: UploadFields<'_>,
) -> Result<(), UploadError>

Uploads one completed voice stream to an SDRTrunk-compatible Rdio Scanner endpoint.

Builds the multipart form from fields, POSTs it to endpoint with User-Agent: sdrtrunk, and verifies the response body contains the "Call imported successfully." marker. Any deviation (network error, non-2xx status, missing marker) becomes an UploadError.

Errors

• UploadError::Http — transport/DNS/TLS/read failure.
• UploadError::Build — multipart part construction failed (invalid filename).
• UploadError::ServerError — non-2xx HTTP status.
• UploadError::UnexpectedResponse — 2xx status but success marker absent from the body.