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Is there a way to print a message to the Telnet client without a command having been entered previously?

In the documentation of the Telnet server the only way to print a message to the client is when previously a command has been entered. I have a case now where I have a long stream of data that I can't store anywhere. I would have to print the values to the Telnet client int16 by int16 and, if possible, so that the old line gets overwritten by the new line. 

If I consider what many great things the Linux community can do in their shell, I think it should definitely be possible somehow. I know it is a questionable approach. I am only the one who is supposed to implement it :)

I just saw that there indeed is a poll function for unsolicited messages. Is that what I am looking for?

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