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---
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title: MMDVM hotspot on Archlinux
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summary: On a Raspberry Pi 2
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date: 2024-01-28T10:10:11+0000
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lastmod: 2024-01-28T20:50:19+0000
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summary: I wrote down the installation of a forked DStarGateway with a slim
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dashboard based on Javascript on a Raspberry Pi 2.
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date: 2024-01-28T23:12:00+0100
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#lastmod:
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categories:
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- amateur-radio
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tags:
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@ -247,74 +248,89 @@ $ sudo systemctl disable serial-getty@ttyAMA0.service
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Open `/boot/cmdline.txt` and remove `console=serial0,115200` from the line. Save
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and reboot.
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Another problem occurs, I will probably have to flash an actual firmware to the modem.
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## Configuration
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~~~console
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E: Received a NAK to the SET_CONFIG command from the modem
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I: MMDVMHost-20240126 exited on receipt of an unknown signal
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~~~
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### DStarGateway
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But we need another compiler. I install [paru](https://github.com/morganamilo/paru)
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to get that compiler with its dependencies.
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### MMDVMHost
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The installation of paru is very easy:
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### dgwtimeserver
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~~~console
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$ sudo pacman -S --needed base-devel
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$ git clone https://aur.archlinux.org/paru.git
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$ cd paru
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$ makepkg -si
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~~~
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## Install a dashboard
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~~~console
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$ paru -Syu
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$ paru -S arm-linux-gnueabihf-gcc
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~~~
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Oh hell, this is going to take ages on the Raspberry Pi 2...
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I will install the [dashboard from John Hays (K7VE)](https://github.com/johnhays/dsgwdashboard)
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as my first look at it looked promising (using Javascript (which is executed
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on the client and not the server) may reduce the load on the webserver).
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[Past installations of dashboards]({{< ref "/posts/2022/26-raspberry-pi-4-64bit-dual-hat-hotspot-without-pi-star" >}})
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did usually include a form of request limitation because the many websocket requests
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of other dashboards put too much pressure on the small Raspberry Pies :exploding_head:
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Meanwhile on my main laptop:
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I will not install this as per instructions, because I don't like when these kind
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of applications (simple dashboards for example) have to be run as the _root_ user.
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I will therefore create a new user called _dashboard_ as which the "webserver"
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(which is a NodeJS application) will run.
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I thought I might try to compile it on my main machine and just do the installation
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on the Raspberry Pi 2 as the compilation is still running (5½ hours later).
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We need a few packages for this:
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~~~console
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$ sudo pacman -S arm-none-eabi-gcc arm-none-eabi-newlib
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$ git clone git@github.com:g4klx/MMDVM_HS.git
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$ cd MMDVM_HS
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$ scp raspi2:git/MMDVM_HS/Config.h .
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$ make
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$ sudo pacman -S nodejs npm
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~~~
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I got some errors about `usbserial` or `USBSerial::begin()`. A short research
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suggested a `depmod -a` and you know what, it compilled.
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Create and impersonate our new user:
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Well, I had to run it as _root_.
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~~~console
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$ sudo useradd --user-group -m --system dashboard --shell /bin/bash
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$ sudo su - dashboard
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~~~
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Now it is time to put the compiled firmware to the Raspi and install it.
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Now we are the user _dashboard_ and we will install the dashboard:
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~~~console
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$ scp bin/mmdvm_f1.bin bin/mmdvm_f1.elf bin/mmdvm_f1.hex raspi2:git/MMDVM_HS/bin/
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$ git@github.com:johnhays/dsgwdashboard.git
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$ cd dsgwdashboard
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$ node -v
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$ npm install -save
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~~~
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Back on the Raspi: the installation won't work as there is no stm32flash installed. Huh?
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Oh well, I could not find it in any repository. The AUR website has a package, but I
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can't find it with pacman or paru. So we install by hand again:
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Create and install some self-signed certificates into the `dsgwdashboard`
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directory because the server needs them to start. I personally would like
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to have the possibility to only serve the pages via plain old HTTP
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(without SSL/TLS) because I run most of my pages through a reverse-proxy
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that takes care of all the certification.
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~~~console
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$ git clone https://aur.archlinux.org/stm32flash.git
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$ cd stm32flash
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$ makepkg -si
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Next we will modify the `dashboard.ini` file because we will change the
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port from 443 to 8443. Why? Because[^1]!
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~~~ini
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[config]
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dgwconfig=/usr/local/etc/dstargateway.cfg
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host=hotspot.oe7drt.net
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port=8443
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~~~
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sudo pacman -S libgpiod
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{{< alert circle-info >}}
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This might be confusing now, the host above does not listen to port 8443 because
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there is a reverse-proxy in-between (and actually a firewall/router too).
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{{< /alert >}}
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And again, back in the firmware repository at `~/git/MMDVM_HS`:
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The actual path of this host and how it will be routed:
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~~~plain
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User (internet) ⇒ router:443 (hotspot.oe7drt.net) ⇒ reverse-proxy:443 (internal-server.lan) ⇒ hotspot:8443 (internal-raspi.lan)
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~~~
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We will disable the shell for the _dashboard_ user because we normally
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won't have to login as _dashboard_ user again.
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~~~console
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$ sudo make mmdvm_hs_hat
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$ sudo chsh -s /bin/false dashboard
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~~~
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[^1]: Ports below <kbd>1024</kbd> can only be used as the _root_ user. Those are socalled
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[privileged ports](https://www.w3.org/Daemon/User/Installation/PrivilegedPorts.html).
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To run the program as non-root user we need to set the port to something
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above <kbd>1024</kbd>.
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## DSTAR Registration
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A DSTAR registration is mandatory if you want to be transmitted on
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