The command tool vclient has a limit of 512 characters for the list of command.
-c, --command <commandlist>

I do read all the command at once to publish them all via mqtt, this fails as my command list is 1938 character long.

Limitation is the commands array that is declared with 512 char long at: https://github.com/openv/vcontrold/blob/master/src/vclient.c#L85
char commands[512] = "";

Could this be increased?