| Value | Meaning |
|---|---|
| unset | Init value. |
| noop | Nothing. |
| prelisten | About to listen. |
| isEmpty | Empty result; nothing read or similar. |
| hasString | String read, ready for processing. |
| timeout | Connection read timed out. |
| warning | Recoverable exception thrown; warn and continue. |
| error | Unrecoverable exception thrown; abort. |
The various states a listening attempt may be in.