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294 lines
7.3 KiB
294 lines
7.3 KiB
---
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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: 2024-01-28T10:12:11+0000
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categories:
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- amateur-radio
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tags:
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- archlinux
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- dstar
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- hotspot
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- linux
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- mmdvm
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- raspberry-pi
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# showBreadcrumbs: true
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# some help
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#
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# highlighting with highlights
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#
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# use table, as inline creates a padding around
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# and it pushes the text more to the right side (end of screen)
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# ~~~html {linenos=table,hl_lines="3-6"}
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# ~~~html {linenos=inline,hl_lines="1,3-6"}
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draft: true
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---
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## Installation ala wiki pages
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I usually setup any Raspberry Pi without screen and keyboard but I make use of
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the [serial console](https://www.raspberrypi.com/documentation/computers/configuration.html#configuring-uarts).
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### Preparations (microSD card)
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Partition the microSD card.
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~~~console
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$ sudo fdisk /dev/sda
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~~~
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~~~
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Device Boot Start End Sectors Size Id Type
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/dev/sda1 2048 411647 409600 200M c W95 FAT32 (LBA)
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/dev/sda2 411648 15759359 15347712 7.3G 83 Linux
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~~~
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Format filesystems.
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~~~console
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$ sudo mkfs.vfat /dev/sda1
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$ sudo mkfs.ext4 /dev/sda2
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~~~
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I am curerntly in `~/mnt`.
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~~~console
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$ mkdir boot root
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$ sudo mount /dev/sda1 boot
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$ sudo mount /dev/sda2 root
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$ wget http://os.archlinuxarm.org/os/ArchLinuxARM-rpi-armv7-latest.tar.gz
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$ sudo bsdtar -xpf ArchLinuxARM-rpi-armv7-latest.tar.gz -C root
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$ sync
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$ sudo mv root/boot/* boot/
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$ sudo umount boot root
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~~~
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So, place the microSD card in the Raspberry Pi and boot it up (with the serial console connected).
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### First start
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There are the following two users pre-defined:
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| Username | Password |
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|------------| -----------|
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| _root_ | _root_ |
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| _alarm_ | _alarm_ |
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I prefer my username as _dominic_, so I changed it:
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~~~console
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# usermod -l dominic -d /home/dominic -m alarm
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# groupmod -n dominic alarm
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~~~
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{{< alert circle-info >}}
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The user _alarm_ may come from **A**rch**L**inux **ARM**.
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{{< /alert >}}
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So the first real thing is upgrading the system. We start as this:
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~~~console
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# pacman-key --init
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# pacman-key --populate archlinuxarm
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# pacman -Syu
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~~~
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Some general system administration tasks as time setup network setup etc...
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I'm using NetworkManager on the Raspi so I install it
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~~~console
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# pacman -S networkmanager
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# nmcli device wifi connect {network-ssid} --ask
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~~~
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Now we may login via ssh.
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## Installation of DStarGateway
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I prefer compiling as normal user so I login as _dominic_. We will need some packages.
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~~~console
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$ sudo pacman -S --needed base-devel wget boost man-db gtest
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~~~
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I hope I got all that we need, if you run into errors, just install the missing ones :wink:
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~~~console
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$ mkdir git && cd git
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$ git clone https://github.com/F4FXL/DStarGateway.git
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$ cd DStarGateway
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$ make
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~~~
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This ran for 38 minutes -- I will not forget to add `-j4` the next time :face_with_rolling_eyes:
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You would now typically install the files but this is the part that made me stop for a while.
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Whatever I was doing, it won't work automated. I'm not a developer, but to me this looks like as
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if `make -C` enters the directory before it runs the top-level Makefile so the `export ...` lines
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never get executed and the Makefiles in the sub-directories will never know about them. I didn't
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want to dive deeper into this and decided to just install the rest by hand.
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~~~console
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$ sudo make install
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~~~
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It will break, but at least install the binary files into `/usr/local/bin`. Also install the
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hostfiles (will need the program _wget_).
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~~~console
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$ sudo make newhostfiles
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~~~
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Copy the systemd unit files to the right directory per hand:
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~~~console
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$ sudo cp debian/* /usr/lib/systemd/system/
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~~~
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{{< alert >}}
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Inspect them because you may edit some paths.
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{{< /alert >}}
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Also have a look at the configuration files in `/usr/local/etc/`.
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Enable the services, but I don't start them yet (except for a short test) because
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the hotspot will connect to the DSTAR reflector but we can't talk or hear anything.
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Once they are enabled, they will autostart at the next reboot.
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To enable the services:
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~~~console
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$ sudo systemctl enable dstargateway.service
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$ sudo systemctl enable dgwtimeserver.service
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~~~
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Because the `make install` did not finish before, I have to manually install the
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`Data` folder contents (AMBE files, Hostfiles). I could not get this to work the
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way it was described in the repository, but I installed them this way:
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Move to the `Data` directory and add the following line on top of the file:
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~~~make
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export DATA_DIR=/usr/local/share/dstargateway.d/
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~~~
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Then rund `sudo make install` within the `Data` directory again and all should be fine.
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## Installation of MMDVMHost
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Also this requires special packages, although I think those are for the new
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FM features -- that a hotspot won't use at all...
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~~~console
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$ sudo pacman -S libsamplerate
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~~~
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~~~console
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$ git clone git@github.com:g4klx/MMDVMHost.git
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$ cd MMDVMHost
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$ make -j4
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$ sudo make install-service
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~~~
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That would fail, but we can do it by hand.
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Setup the user _mmdvm_:
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~~~console
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$ sudo useradd --user-group -M --system mmdvm --shell /bin/false
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$ sudo usermod --groups uucp --append mmdvm
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~~~
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So we run the command one more time:
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~~~console
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$ sudo make install-service
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~~~
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Binaries are installed and the systemd unit files too.
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Modify the configuration file `/etc/MMDVM.ini`.
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Enable the service:
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~~~console
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$ sudo systemctl daemon-reload
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$ sudo systemctl enable mmdvmhost.service
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~~~
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## Setup the UART
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We can't start MMDVMHost right away (well, we can, but it will not work yet).
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We need to disable the serial console because we need the UART at the GPIO pins
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for our modem hardware.
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Disable the service, that accesses the serial console:
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~~~console
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$ sudo systemctl disable serial-getty@ttyAMA0.service
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~~~
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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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~~~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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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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The installation of paru is very easy:
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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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~~~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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## DSTAR Registration
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A DSTAR registration is mandatory if you want to be transmitted on
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original ICOM repeaters. Otherwise your transmission will not be
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forwarded properly and you may look for errors for a long time...
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I registered in 2020 at <https://regist.dstargateway.org/> but there
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is one important thing to add to the webui there: do not choose long
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passwords (like those from a password manager) because it will get
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cut off somewhere and it took me quite a while to find that error.
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{{< alert skull-crossbones >}}
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**I can't believe that there are still websites in 2024 that limit
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the lenght of a password!**
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{{< /alert >}}
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I do have 12 characters now, I usually use 20 or more.
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