💬 Building a Raspberry Pi Gateway

  • Hey guys,

    I tried to setup my Raspberry running Node-RED and serial gateway but I got stuck halfway. I followed the serial gateway compilation above and got it up and running, however using the serial nodes an Node-RED I could not manage to get them to connect tho the gateway.

    First I tried to connect to /dev/ttyMySensorsGateway which did not work due to permissions (owned by root). When checking out /dev/ttyMySensorsGateway I found it links to /dev/pts/1
    which belongs to root and the tty group. But I could not connect to this as the tty group only has write privileges. I think I miss some crucial point connecting those two together so I hope somebody can save the day by pointing me in the right direction.

    Thanks in advance,

  • Admin


    So you run a separate arduino board as a mysensors gateway, connected with serial (USB) to your raspberry pi? Or do you mean that you are using the rpi directly with radio, and then run the rpi variant of the mysensors gateway code?

  • @tbowmo I run the gateway on my Pi directly with the radio is connected to the Pi's GPIOs. Compilation and gateway do just fine I, if only I could convince my Pi to let Node-RED talk to the device 😄

    This is my output:

    dietpi@buddy:~ $ ll /dev/ttMySensorsGateway 
    lrwxrwxrwx 1 root root 10 Jun 18 14:38 /dev/ttMySensorsGateway -> /dev/pts/2
    dietpi@buddy:~ $ ll /dev/pts/
    total 0
    crw--w---- 1 dietpi tty  136, 0 Jun 18 14:38 0
    crw--w---- 1 dietpi tty  136, 1 Jun 18 14:38 1
    crw--w---- 1 root   tty  136, 2 Jun 18 14:38 2
    crw--w---- 1 dietpi tty  136, 3 Jun 18 14:38 3
    c--------- 1 root   root   5, 2 Nov  3  2016 ptmx

  • Mod

    wasn't it the problem of the missing permission on the dialup group?

  • Unfortunately adding my nodered user to dialout did not bring the hoped success. I still get premission denied messages after a reboot of my raspberry.

    As my console print above shows the /dev/pts device belongs to tty but adding nodered to tty did not work out either (since the group only has write privileg). I have no idea how to fix this other then chowning the port to nodered but that feels wrong for me after years using linux based systems.

  • Mod

    it is not a solution, but you could switch to ethernet GW and you will avoid all the permissions problems.

  • Admin

    My 5 cents:
    Run it as a MQTT gateway, if possible. It makes things so much easier, when you interact with the data in node-red. Even integrating other controllers is easier, as you have the MQTT as standard backbone bus between everything.

    You need to have a MQTT broker (mosquitto) running as well.. But it's worth it..

  • Yes I came to the conclusion that this might be my only option even if it sucks as I have to subscribe to all events from MySensors, process them with Node-RED and republish again which screws my logging a bit. Right now I have another flow subscribed to "#" and write every event into my DB.

    Since I have everything talking to mosquitto setup to follow Homie Convention I was hoping for only having my MQTT broker bombarded with compliant messages and have Node-RED convert everything (assign device names, etc. using a SQLite DB) from serial so the rather cryptic MySensors topics do not show up there.

  • Mod

    @mirodin you actually need only mysensors-in and mysensors-out topics and their subtopics

  • @gohan Yes I know but now I can no longer just wildcard-dump every event on my mosquitto instance into my DB as I need to filter out the mysensor-in and -out topics.

  • Mod

    Or meanwhile just use the ethernet gw

  • Well... I think I fixed it, let's hear it for documentation. Just when I had MQTT setup half way I got struck by the idea that there was some group flag for configure. And indeed there is, setting --my-serial-groupname=nodered did the trick making /dev/pts/X owned by group nodered and let Node-RED connect to it, writing and reading works just fine now.

    Thanks @gohan for your input I think I would have gone the ethernet route in the end if this last test had failed.

  • I am currently trying to update to 2.3
    Have stopped service and deleted the file (systemctl status mysgw -> Unit mysgw.service could not be found.)
    Also renamed the config file /etc/mysensors.dat
    Renamed the old folder, then copied new files.
    Checked readme.md in MySensors-folder: MySensors Library v2.3.0
    Then I configured the radio and -> make, no errors
    However, changing to bin folder and executing mysgw shows: Protocol 2.2.0
    What am I missing?

  • @inso Did you sudo make install after building it? This command copies the service file and mysgw to their respective locations.

  • Mod

    @inso remember to unregister the service and then make a new make install of the new gw

  • Mod

    @gohan how is the unregistration done? I didn’t know that was needed. We should probably add upgrade instructions to the build page.

  • @mirodin
    make install before testing did the trick, now it is 2.3.0 . 😃
    Was just going step by step through tutorial, there it´s make -> test -> make install. Didn´t realized it would use old parts if it´s not first install ☺

    thought stop, disable and remove the service would be enough to ensure the service is completely "uninstalled" - could you give me a hint what I´ve missed? 😅

  • Hi,
    I try to access log info from my gateway installed on my domoticz raspberry pi, but I get no success..
    First, I can't find the mysensors.conf file : nothing in the /etc folder. I tried to use "find / -name 'mysensors.conf' 2>/dev/null" command, but it finds nothing.
    I tried creating such a file (then it's found by the fond command above) and in which I have the lines


    as instructed above.
    I restarted the wole Raspberry PI, then tried the command cat /tmp/mysgw.pipe but error message:

    cat: /tmp/mysgw.pipe: Aucun fichier ou dossier de ce type

    (= no file or folder like that)
    I then tried this: sudo mysgw -c /etc/mysensors.conf and I got also error message:

    mysgw: invalid option -- 'c'

    I installed the Mysensor gateway on 17th October 2017 and my raspberry pi is working on Wheezy. In Domoticz, I see the Mysensor gateway has version 2.1.1.
    MY gateway seems working fine, communicating properly with sensors (both ways). I'm trying to find log because I face an issue with a new sensor which works properly when powered with external FTDI 3.3V and only 1 way (sensor to gateway only) when powered on battery (I raised question in another post, where I was suggested to check log fil on gtw side..)

    Any idea of what I should do (except "reinstall whole raspberry pi with latest OS..) ?
    Thanks a lot,

  • Mod

    @ricorico94 there seems to have been some major changes in the raspberry pi gateway, without vorresponding updates to the documentation.

    I have not been able to locate the exact changes though. @marceloaqno might know.

  • Mod

  • @mfalkvidd : thanks a lot ! I had searched for such version history and couldn't find it.
    Indeed it seems introduction of the switches for log files was introduced in February, so I should probably update my install.

    Precisely, talking about upgrade process: I read in previous posts that we should uninstall/unregister the install/service. WHat would be commands to do so ? Should it be:

    sudo systemctl disable mysgw.service

    and executed before anything else ? So upgrade process would be:

    sudo systemctl disable mysgw.service
    sudo make install
    sudo systemctl enable mysgw.service

    (and maybe test the gateway before the "systemctl enable..")
    Is there anyfile to remove manually ? or any other command to apply before or after ?

  • Would someone be willing to create a post that lists each step required to set up the simple encryption+signing option? I understand I have to add a password line to the arduino sketch. But how exactly one sets up the server side is still a bit of a mystery to me. It would rock if there was a similar simple command to give during the make process.

  • Contest Winner

    @alowhum https://www.mysensors.org/apidocs/group__RaspberryPiGateway.html
    That is straight from the documentation. Which in the case of Linux ports is also what you get if you issue ./configure --help
    I believe.

  • @alowhum
    I also need this info...

  • Code Contributor

    @ricorico94 to update your install run:

    sudo make install
    sudo systemctl restart mysgw.service

  • Thank you for the clarification !

  • @anticimex said in 💬 Building a Raspberry Pi Gateway:


    @Anticimex Thanks, but a documentation page (which I have checked before) is not the same as an easy to use guide for beginners.

    In my ideal world it would be this:

    1. Add the MY_SIMPLE_PASSWORD line to your Arduino sketch.
    2. Compile the gateway with --MY_SIMPLE_PASSWORD="yabadabad000!"
    3. Done

  • Contest Winner

    @alowhum it is not easy to have simple guides tailored for specific usecases when there are so many options.
    Those tend to not follow implementation and our documentation is made to live with the implementation to ensure it is always up to date. Maintaining a simple guide for every conceivable use case is simply not feasible. The signing and security documentation does have a step by step guide for setting up security.

  • @Anticimex: I understand, but:

    • Currently even the outline of the steps eludes me. Seeing the steps for usecase #14 or #385 would already help me understand the scope, and to see what ballpark of difficulty it's in. It's easier to mod a guide when there is something to go on.
    • Secondly, there must be a common use case? The defaults that MySensors uses already suggests a lot of these: a Raspberry Pi with the default settings of the software (ethernet), with the nRF24 radio.

  • Contest Winner

    @alowhum ok, well first of all, I don't have a rPi setup to test on, secondly I don't have time to look into that (this) environment.
    But, this is a open source project so anyone is free to contribute with both code and documentation (which in our case lives in the same repositories) so if there are guides missing enyone is welcome to contribute with experiences and guides to help others out.
    It is just important to understand that the guides need to be maintained in order to remain valid.
    I don't mind guides at all. But it makes little sense for me to write guides for an environment which I am not familiar with nor can test on.

  • @Anticimex: Sure, that's totally understandable. There are other people on the forum 🙂 Can anyone help me and @pepson out?

    And it is exactly my goal to create a more elaborate guide after someone points out the basic steps.

  • I have designed a 3D printable enclosure for this and the design/STL files are available here: https://www.thingiverse.com/thing:3072244

  • Admin

    @John-Oliva, nice! Added it to the MySensors collection:

  • @korleone HI
    I have same error
    Can you write that rigth do you ser to folder ?

  • @cadet I just remove /usr/local/bin/mysgw and compile again
    And I have one question - why is it happened?
    MysGW work fine about 3 months.

  • Mod

    what problem did you have?

  • @gohan mysgw: ERROR accept: Bad file descriptor - today morning

  • Mod

    I get that when another instance of the process is already running

  • @gohan I was try to find it with ps -ef, but nothing found. Reload RPI.
    @korleone was write about this
    "Hello, it seems I found the problem: Complete newbie thing: 🔰
    sudo ./bin/mysgw -h worked, but /usr/local/bin/mysgw didn't
    I just gave the right to the folder, and now it's working."

    But what right hi gave ?

  • Mod

    sudo ./bin/mysgw -h could work, it only depends in which folder you are running the command from

  • FYI looks like on the 2.3.1 beta the transport has been changed to rf24 instead of nrf24

  • Is the rasberry pi serving as a gateway and a server in this project? Or do you have to have a separate pi to host something like openhab and another pi for your gateway?

  • Mod

    Hi @magjef29, welcome to the MySensors forum!

    You can run your controller(s) on the same Raspberry Pi.

    Depending on what tou mean by ”server”, the gateway can be a server, but the gateway is not a controller.

    If you haven’t already, see the getting started guide for information about the different parts.

  • Hi! Does anybody test Cubieboard as Gateway? I have a cubieboard runing archlinux with spi enabled in kernel. How i define pins for nrf24 gateway connection? Or i need to make big changes in code to star work with different bord than Rpi?
    Best regards

  • This is my old dream to connect directly nrf to Cubieboard GPIOs. Few years ago i try to do this without success using this lib - https://github.com/bearpawmaxim/librf24-sunxi

  • Mod

    Hi @артем-тихонович, welcome to the MySensors forum!

    For the NRF24, the same defines as for normal sketches are used. Documentation: https://www.mysensors.org/apidocs/group__RF24SettingGrpPub.html
    The defines can be added to the Raspberry Pi gateway by following the instructions on https://www.mysensors.org/build/raspberry#advanced

    I have not heard about anyone using the Cubieboard but hopefully someone else has. The information provided on https://www.mysensors.org/build/orange might be useful if the Cubieboard is similar to the Orange Pie.

    oh, and in case you haven't already, see the ./configure --help text about the most common NRF24 defines; you might not need the advanced build options.

  • Thank you, @mfalkvidd. Ihave a little troubles with correct defining gpios from Cubie. In fex file the gpios defines is:
    gpio_used = 1
    gpio_num = 2
    gpio_pin_1 = port:PH07<0><default><default><default>
    gpio_pin_2 = port:PH15<6><default><default><default>
    in sys/gpio:
    [root@Archey boot]# ls -ls /sys/class/gpio/
    total 0
    0 --w------- 1 root root 4096 Nov 21 11:58 export
    0 lrwxrwxrwx 1 root root 0 Nov 18 17:01 gpio1_ph7 -> ../../devices/platform/gpio-sunxi/gpio/gpio1_ph7
    0 lrwxrwxrwx 1 root root 0 Nov 21 11:54 gpio2_ph15 -> ../../devices/platform/gpio-sunxi/gpio/gpio2_ph15
    0 lrwxrwxrwx 1 root root 0 Nov 18 10:45 gpiochip1 -> ../../devices/platform/gpio-sunxi/gpio/gpiochip1
    0 --w------- 1 root root 4096 Nov 18 16:52 unexport

    When i define in configure: --my-rf24-ce-pin=1 --my-rf24-cs-pin=2 build is ok, but test failed with error:
    Nov 21 11:58:15 ERROR Could not open /sys/class/gpio/gpio1/direction[root@Archey MySensors]#
    when i define --my-transport=nrf24 --my-rf24-ce-pin=gpio1_ph7 the build failed wirh error:
    ./drivers/RF24/RF24.cpp: In function 'void RF24_ce(bool)':
    <command-line>:0:16: error: 'gpio1_ph7' was not declared in this scope
    ./drivers/RF24/RF24.cpp:52:17: note: in expansion of macro 'MY_RF24_CE_PIN'
    hwDigitalWrite(MY_RF24_CE_PIN, level);

    How can i resolve this problem? Please help.

  • I just see for another app using nrf24 on cubieboard
    and funcrtion to use nrf24 have GPIO defining is RF24 radio(SUNXI_GPB(10), SUNXI_GPB(11), "/dev/spidev0.0");
    GPIO set using this style: SUNXI_GPB(10), this type of gpio defined in #include "gpio_sun4i.h" file. Maybe this specific defining in ARCHLINUX ARM distro.

  • I hereby donate these images:

    4_1542918057729_step1.png 3_1542918057729_step2.png 2_1542918057728_step3.png 1_1542918057727_step4.png 0_1542918057727_step5.png

  • Mod

    In case someone can help @артем-тихонович, please post the answer in https://forum.mysensors.org/post/95304 so we don’t unnecessarily discuss the same thing in separate threads.


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