I want to use collectd to periodically gather information from my solar charge controller. That thing speaks modbus and got a bunch of registers to read quite everything one could want to have beautiful graphs drawn with RRDtool. Therefore I first made a package Makefile for libmodbus and then patched collectd's modbus plugin to work with the current version of libmodbus. I'm planing to further work on collectd so it can support Modbus-RCU as well (currently only Modbus-TCP is supported)
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