Function write_message 

pub async fn write_message<W, T>(
    w: &mut W,
    message: &T,
) -> Result<(), DaemonError>
where
    W: AsyncWrite + Unpin,
    T: Serialize,

Write one length-prefixed JSON message to w.

Errors

Returns DaemonError::Io on a transport failure or DaemonError::Protocol if the message serializes to a body larger than MAX_MESSAGE_BYTES.