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Gordon
If AT+FOO returns 3 lines, your handler needs to accept all of those lines.

If it doesn't then yes, your next call to AT.CMD may return the extra line. The AT library does flush lines, but obviously if you issue the command right after, while the last response is still coming in, it has no idea what line is from the old command and what's from the new.

For example, this is what you're suggesting I think?
```
Send> AT+FOO
Recv< FooOne -> foohandler
Recv< FooTwo -> foohandler
Send> AT+BAR
Recv< FooThree -> barhandler
Recv< BarOne -> thrown away
```
or if you just waited, the line would be thrown away:
```
Send> AT+FOO
Recv< FooOne -> foohandler
Recv< FooTwo -> foohandler
Wait 100ms before sending...
Recv< FooThree -> thrown away
Send> AT+BAR
Recv< BarOne -> barhandler
```
Realistically you want to handle all lines you're expecting to receive though. Not doing that is just asking for pain later on :)

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