mbtools

Description

Modbus tools based on libmodbus to log data fetched by a master/client or received by a slave/server (writing of registers). mbcollect is able to act as client or server (in TCP or RTU):

• in client/master mode, it reads addresses defined by the user at regular interval and output results to a local Unix socket
• in server/slave mode, it waits for requests from other devices and output register writes to a local Unix socket.

Requirements

automake libtool pkg-config libglib2.0-dev libmodbus >= v3.1.1

Installation

$ ./autogen.sh
$ ./configure
$ make

Testing

To run the full suite of tests, you need to connect two USB-serial adapters on the same link. The tests assume there seen as ttyUSB0 and ttyUSB1. You must be able to open port 1502 on your localhost for TCP unit tests. Once you're ready, you can launch the 4 tests with:

$ cd tests
$ python ./testcase.py

To launch one test at once, you must specify the class of TestCase:

$ python -m unittest testcase.ClientTestCase

Settings

The program mbcollect accepts many options from command line, all options from command line are also available in config .ini file. Some options related to remote slave/server when in master/client mode are only available in .ini file.

To list all available options:

$ ./mbcollect --help

All these options are also available in the [settings} section of config .ini file:

[settings]
mode = client
socketfile = /tmp/mbsocket
interval = 1
verbose = 1

To define, the servers/slaves to read you can add one or many sections like this one in your config .ini file:

[server "faraway"]
# A server called 'faraway' with IP 192.18.0.5
ip=192.168.0.5
port=502
# Read 4 integers at address 0
# Read 1 float at address 10
addresses=0;10;
lengths=4;1;
types=int;floatmsb;

If mbcollect runs in:

• client mode, the [settings] and [server] sections will be used
• master mode, the [settings] and [slave] sections will be used, this section allows to define slave ID instead of IP address and port number.
• server and slave modes, only the common settings section will be used

See tests/ for a list of config file examples.

Stop and reload

The programs are designed to handle SIGTERM to stop them. mbcollect is also able to reload its config file on SIGHUP signal.