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202 lines
7.0 KiB
Markdown
202 lines
7.0 KiB
Markdown
About mbusd
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===========
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[](https://github.com/3cky/mbusd/actions/workflows/build.yml)
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**mbusd** is open-source [Modbus TCP to Modbus RTU (RS-232/485)](https://en.wikipedia.org/wiki/Modbus)
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gateway. It presents a network of RTU slaves as single TCP slave.
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That is a TCP-Slave (or server) which acts as a RTU-master to get data from Modbus RTU-slave devices.
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Features:
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---------
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* Small footprint - suitable to run on embedded devices and SBCs like Raspberry Pi
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* Multi-master - multiple TCP masters can access slave devices in RTU network using same gateway
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* Robustness - can retry requests with mismatched response CRC
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* Flexible RTU modes - speed/parity/stop-bits/timeouts can be configured for RTU network
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* Support for both of automatic and manual (using RTS bit) direction control types for RS-485 transceivers
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Supported function codes:
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-------------------------
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* 01: Read coil status
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* 02: Read input status
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* 03: Read holding registers
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* 04: Read input registers
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* 05: Force single coil
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* 06: Preset single register
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* 07: Read exception status
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* 15: Force multiple coils
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* 16: Preset multiple registers
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Please note all other function codes (including vendor-specific extensions) are supported on a "best-effort" basis and most likely will fail.
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Installation instructions:
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----------------------------
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```
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$ git clone https://github.com/3cky/mbusd.git mbusd.git
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$ cd mbusd.git
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$ mkdir -p build && cd build
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$ cmake -DCMAKE_INSTALL_PREFIX=/usr ..
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$ make
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$ sudo make install
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```
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***Compile time options***
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can be altered in many ways, e.g. by using the following tools in the `build` dir:
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* ccmake - usually in the package cmake-curses-gui
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* cmake-gui - usually in the package cmake-qt-gui
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Usage:
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------
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mbusd [-h] [-d] [-L logfile] [-v level] [-c cfgfile]
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[-p device] [-s speed] [-m mode] [-S]
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[-t] [-y sysfsfile] [-Y sysfsfile]
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[-A address] [-P port] [-C maxconn] [-N retries]
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[-R pause] [-W wait] [-T timeout]
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-h Usage help.
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-d Instruct mbusd not to fork itself (non-daemonize).
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-L logfile
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Specifies log file name ('-' for logging to STDOUT only, default is /var/log/mbusd.log).
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-v level
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Specifies log verbosity level (0 for errors only, 1 for warnings
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and 2 for also information messages.) If mbusd was compiled in debug mode,
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valid log levels are up to 9, where log levels above 2 forces
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logging of information about additional internal events.
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-c cfgfile
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Read configuration from cfgfile.
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-p device
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Specifies serial port device name.
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-s speed
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Specifies serial port speed.
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-m mode
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Specifies serial port mode (like 8N1).
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-S Enable RS-485 support for given serial port device (Linux only)
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-t Enable RTS RS-485 data direction control (if not disabled while compile).
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-y file
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Enable RS-485 direction data direction control by writing '1' to file
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for transmitter enable and '0' to file for transmitter disable
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-Y file
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Enable RS-485 direction data direction control by writing '0' to file
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for transmitter enable and '1' to file for transmitter disable
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-A address
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Specifies TCP address to bind (default 0.0.0.0).
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-P port
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Specifies TCP port number (default 502).
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-C maxconn
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Specifies maximum number of simultaneous TCP connections.
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-N retries
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Specifies maximum number of request retries (0 disables retries).
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-R pause
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Specifies pause between requests in milliseconds.
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-W wait
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Specifies response wait time in milliseconds.
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-T timeout
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Specifies connection timeout value in seconds (0 disables timeout).
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-b
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Instructs mbusd to reply on a broadcast.
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Please note running **mbusd** on default Modbus TCP port (502) requires root privileges!
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Configuration file:
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-------------------
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**mbusd** can read the configuration from a file specified by `-c` command line flag.
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Please see [example configuration file](conf/mbusd.conf.example)
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for complete list of available configuration options.
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systemd:
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---------------
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**mbusd** has [systemd](https://wiki.archlinux.org/index.php/systemd) support.
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The build system detects whether the system has systemd after which `sudo make install`
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installs the `mbusd@.service` file on systems with systemd active.
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The **mbusd** service can be started via:
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# systemctl start mbusd@<serial port>.service
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where `<serial port>` is escaped serial port device short name (like `ttyUSB0` for `/dev/ttyUSB0` device name or `serial-rs485` for `/dev/serial/rs485` device name).
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**mbusd** started by systemd will read its configuration from file named `/etc/mbusd/mbusd-<serial port>.conf`.
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This way it's possible to run multiple **mbusd** instances with different configurations.
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To see the **mbusd** service status:
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# systemctl status mbusd@<serial port>.service
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To monitor the **mbusd** service:
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# journalctl -u mbusd@<serial port>.service -f -n 10
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To start the **mbusd** service on system boot:
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# systemctl enable mbusd@<serial port>.service
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Please check systemd documentation for other usefull systemd [commands](https://wiki.archlinux.org/index.php/systemd)
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Contributing:
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-------------
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### Reporting bugs
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Please file [issue](https://github.com/3cky/mbusd/issues) with attached debug log in verbose (`-v9`) mode, i.e.:
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# mbusd -L/tmp/mbusd.log -p /dev/ttyUSB0 -s 9600 -P 502 -d -v9
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Unless you were prompted so or there is another pertinent reason (e.g. GitHub fails to accept the bug report),
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please do not send bug reports via personal email.
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### Workflow for code contributions
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1. Fork it and clone forked repository
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2. Create your feature branch (`git checkout -b my-new-feature`)
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3. Make your changes
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4. Commit your changes (`git commit -am 'Add some feature'`)
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5. Push to the branch (`git push origin my-new-feature`)
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6. Create new Pull Request
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### Building and Testing
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Dependencies: please see the correct OS-distribution section in the
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[.gitlab-ci.yml](https://github.com/3cky/mbusd/blob/master/.gitlab-ci.yml)
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With all dependencies met, one is able to *build and execute tests*
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issuing the following *bash* commands:
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```
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# build
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mkdir output.dir/ && cd $_
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cmake ../ && make
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# execute all tests
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(cd ../ && python tests/run_itests.py output.dir/mbusd)
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```
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Author:
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-------
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Victor Antonovich (<v.antonovich@gmail.com>)
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Contributors:
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-------------
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Andrew Denysenko (<nitr0@seti.kr.ua>):
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- RTS RS-485 data direction control
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- RTU response receiving by length
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James Jarvis (<jj@aprsworld.com>):
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- file based RS-485 data direction control
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Luuk Loeffen (<luukloeffen@hotmail.com>):
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- systemd support
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Nick Mayerhofer (<nick.mayerhofer@enchant.at>):
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- CMake build system
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License:
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--------
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This project is distributed under the BSD license. See the [LICENSE](LICENSE) file for the full license text.
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