Support for HomeMatic/homematicIP communication

[honsma235]

Till a few weeks ago I had Debian installed on my rock-4se with an home assistant supervised install.
That worked quite ok, until it stopped booting after I updated the OS :/. After i realized I am not able to fix the problem and I will have to install from scratch, I though I might give your fork another chance. Last time I tried, about a year ago, it didn't want to boot on my board, but this time it worked right away. Loaded my backup and it was up and running.

I was happy to leave the supervised install behind, but then I noticed that the RaspberryMatic Addon was not working as it didn't find my USB RF-Module (HMIP-RFUSB).
Upon investigating your fork I noticed that the necessary kernel modules 'eq3_char_loop' and 'generic_raw_uart' aren't present. Upstream they get pulled in with "BR2_PACKAGE_RPI_RF_MOD", but neither is active in your configs for the Rock* boards.

I tested it on my rock-4se board and my RF-Module works if the packages BR2_PACKAGE_EQ3_CHAR_LOOP and BR2_PACKAGE_GENERIC_RAW_UART are activated.

I don't think there is any downside. As far as I know, they only add two kernel modules necessary for some specific hardware.

[citruz]

Oh now I see why the BR2_PACKAGE_RPI_RF_MOD package is enabled in all configs upstream even for devices that are not a raspberry pi 🙃
We could also enable that instead of adding the two packages explicitly. I'm wondering if BR2_PACKAGE_RPI_RF_MOD itself is installing anything at all if none of the BR2_PACKAGE_RPI_RF_MOD_DTS_* options are set.

[honsma235]

I tried to enable BR2_PACKAGE_RPI_RF_MOD only and my RF-Module was working.
But I didn't dig into what actually happens inside the package.

Maybe @jens-maus could comment on this. I think he would know right away.

[citruz]

I checked and the only thing it does is installing a rules file to /lib/udev/rules.d/. But let's stay consistent with the other configs and enable BR2_PACKAGE_RPI_RF_MOD instead of the two individual packages.
Do you want to update your PR so that you are credited as a contributor? I try to keep the config options alphabetically sorted so please at it after BR2_PACKAGE_RPCBIND.

[honsma235]

Done.

Just for reference, here is the PR where this got added upstream: home-assistant#1266