PJON

Here the repo: https://github.com/gioblu/PJON/tree/master/strategies/Softwa... This is a totally software emulated single wire, multi-master data link implemented in less than 200 lines of code, supporting direct pin to pin communication with more than 50 meters range.

Exactly is funny to think that this bunch of methods are doing all the data-link job with no additional hardware using only micros() and delayMicroseconds(): https://github.com/gioblu/PJON/blob/master/strategies/Softwa... Here instead using AnalogSampling PJON can communicate wirelessly using only 2 visible light LEDs, used both as transmitters and photodiodes on the same pin :) https://github.com/gioblu/PJON/tree/master/strategies/Analog...

Ciao anfractuosity, Modbus have more "dedicated" and shorter (255 bytes) data frame and in my opinion is a little more narrow in its applications, its overhead if I am not mistaken is also high (11 bytes). PJON works with no additional hardware at the voltage level you prefer, totally software emulated, is a network protocol stack of 2 layers (data-link and protocol layer) can send packets of 255 or 655353 bytes, can support up to 255 devices connected on the same wire, or up to 1.090.921.692.930 devices in a bus network of up to 4.294.967.295 buses, it supports CRC8 or CRC32 at users choice and have an overhead added to information varying from 3 up to 19 bytes (thanks to a header configuration driven packet format). PJON also supports 2 different types of acknowledgment (sync and async). Being the data link level handled "agnostically"

The actual wire format: https://github.com/gioblu/PJON/blob/master/strategies/Softwa... Somewhat similar to Dallas 1-wire.

GitHub page has a much better introduction than this beautiful yet uninformative website. https://github.com/gioblu/PJON PJON™ (Padded Jittering Operative Network) is an Arduino compatible, multi-master, multi-media communications bus system. It proposes a Standard, it is designed as a framework and implements a totally software-emulated network protocol stack. It is a valid alternative to i2c, 1-Wire, Serial and other Arduino compatible protocols. Visit the Wiki, Documentation and Troubleshooting wiki pages to know more about the PJON Standard. Get PJON bus id Video introduction Join the chat at https://gitter.im/gioblu/PJON Donate Features * Configurable 2 level addressing (device and bus id) for scalable applications * Multi-media support with the data link layer abstraction or Strategy framework * Configurable strategies inclusion