send
Serializes and queues the given payload object for sending to the counterparty. Suspends until a response is received, which must be of the given R type.
Note that this function is not just a simple send+receive pair: it is more efficient and more correct to use this when you expect to do a message swap than do use FlowSession.send and then FlowSession.receive in turn.
Return
The received data R
Parameters
R
The data type received from the counterparty.
payload
The data sent to the counterparty.