On 02/07/2018 06:39 PM, Rudolf Bahr wrote:
Sometimes the necessity could arise to send data from lua to context
and answers back to lua. I tried this by using "read" and
"immediate\write" commands in context. These commands are described
in chapter 21 and 22 of Donald E. Knuth's "The TeXbook".

My question is: Do there exist better and more simple solutions?

You can print (typeset) information from inside lua code with the "context" function. Have you seen the manual cld-mkiv.pdf? It's in the minimals.

If your question is of interest to others as well, please add an entry to the 

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net

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