Transactional memory bridge to Modbus RTU. Expandable to other buses such as DMX.

Uses Haskell Software Transactional Memory to translate imperative nature of field buses to declarative definition.

Still work in progress, but used in daily basis at Hacklab Jyväskylä club room for controlling the alarm system, lighting, and power sockets.

If you have Debian or Ubuntu, I'd recommend installing all available dependencies from their repositories to minimize package clutter.

Then, only curl-aeson and hackbus itself are installed user-wide.

sudo apt install \
	cabal-install \
	libghc-stm-dev \
	libghc-text-dev \
	libghc-aeson-dev \
	libghc-network-dev \
	libghc-readline-dev \
	libghc-curl-dev \
	libghc-utf8-string-dev \
	libghc-monad-loops-dev \
	libmodbus-dev
cabal v1-update
cabal v1-install

On other systems with Cabal, run

cabal update
cabal install

There is interactive GHCi shell available for testing and setting module parameters such as addresses. Tab completion works in both device file entry and in the shell.

Before it works, the cabal package needs to be installed, of course.

$ cd interactive/modbus
$ ghci
GHCi, version 8.4.4: http:https://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Interactive      ( Interactive.hs, interpreted )
Ok, one module loaded.
Device file: /dev/ttyUSB0
Initialized, ModbusHandle in "h"
Loaded GHCi configuration from /home/user/hackbus/interactive/.ghci
*Interactive System.Hardware.Modbus> setSlave h 1 >> writeRegister h 0x40002 2

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.