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PJON protocol stack, project homepage https://www.pjon.org/
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This is a collection of example PJON communication. Subdirectories contain
different types of communication (link layers, or setups).

PJON protocol and PJDL link layer specs:
https://www.pjon.org/PJON-protocol-specification-v3.2.php
https://www.pjon.org/PJDL-specification-v4.1.php