# \#low-code

**URL:** https://erlangforums.com/tag/low-code/877.md

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## [Binary packet definition languages](https://erlangforums.com/t/binary-packet-definition-languages/4957)

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**Author:** [@gorenje](https://erlangforums.com/u/gorenje)\
**Replies:** 11\
**Last updated:** [August 11, 2025, 12:08am UTC](https://erlangforums.com/t/binary-packet-definition-languages/4957 "2025-08-11T00:08:03Z")

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Hi There, Working on the Erlang-Red and specifically an MQTT emulation flow, I noticed how simple yet complicate binary definitions in Erlang are: \<\<\_:8/bits, 1:1, Len:7/bits, 1:1, Len2:7/bits, 1:1, Len3:7/bits, 0:1, L…