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