readLine returns the next inbound line (without terminator) or null at
EOF (and the read loop ends). writeLine emits one outbound line. onInbound
is invoked for every inbound request / notification line (never for a
response, which the channel correlates itself).
readLine returns the next inbound line (without terminator) or null at EOF (and the read loop ends). writeLine emits one outbound line. onInbound is invoked for every inbound request / notification line (never for a response, which the channel correlates itself).