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System testing for [modbus library](https://github.com/goburrow/modbus)
Modbus simulator
----------------
* [Diagslave](http://www.modbusdriver.com/diagslave.html)
* [socat](http://www.dest-unreach.org/socat/)
```bash
# TCP
$ diagslave -m tcp -p 5020
# RTU/ASCII
$ socat -d -d pty,raw,echo=0 pty,raw,echo=0
2015/04/03 12:34:56 socat[2342] N PTY is /dev/pts/6
2015/04/03 12:34:56 socat[2342] N PTY is /dev/pts/7
$ diagslave -m ascii /dev/pts/7
# Or
$ diagslave -m rtu /dev/pts/7
$ go test -v -run TCP
$ go test -v -run RTU
$ go test -v -run ASCII
```
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