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Argument parsing issue for nngproxy

1

**Describe the bug** The `nngproxy` subcommand of `nanomq_cli` does not work for me due to an argument parsing issue. I have to revert the change in e9fe4b17 for `nng_proxy.c` (i.e....

I have a composite machine, and I want to dispatch an event to the parent. It works when using `process(ev_success{})` in the transition table of the sub machine, but it...