Here is a patch for indi-armadillo-platypus to add Appstream metainfo
XML announcing the hardware handled by this package.

Including this information in the package will ensure programs mapping
hardware to packages using Appstream information, like the isenkram
package, will know that this package is useful on machines where the USB
IDs are discovered.  It will also solve the
appstream-metadata-missing-modalias-provide lintian issue.

diff --git a/debian/com.github.indilib.indi-3rdparty.metainfo.xml b/debian/com.github.indilib.indi-3rdparty.metainfo.xml
new file mode 100644
index 0000000..48bfdf6
--- /dev/null
+++ b/debian/com.github.indilib.indi-3rdparty.metainfo.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component>
+  <id>com.github.indilib.indi-3rdparty</id>
+  <metadata_license>MIT</metadata_license>
+  <name>indi-armadillo-platypus</name>
+  <summary>INDI driver for Lunatico Astronomia Armadillo and Platypus</summary>
+  <description>
+    <p>This package contains the INDI driver for Armadillo and
+    Playtypus from Lunatico Astronomia.</p>
+    <p>This driver is compatible with any INDI client such as KStars
+    or Xephem.</p>
+  </description>
+  <provides>
+    <modalias>usb:v16C0p09B1d*</modalias>
+  </provides>
+</component>
diff --git a/debian/indi-armadillo-platypus.install b/debian/indi-armadillo-platypus.install
new file mode 100644
index 0000000..ee3cc69
--- /dev/null
+++ b/debian/indi-armadillo-platypus.install
@@ -0,0 +1 @@
+debian/com.github.indilib.indi-3rdparty.metainfo.xml usr/share/metainfo

Hi Petter,

thanks a lot for this patch, the Appstream stuff is like a book of seven
seals for me.

There are lots of drivers in this repository, distributed over several
packages. Shouldn't there be a unique id for each package?

   Thorsten

[Thorsten Alteholz]

Yes, most likely.  I just had a look at the homepage url in d/control
and synthesized something I hoped was unique.  I did not know there were
several packages with the same homepage url.  Please make a better ID.
The only requirement is reverse DNS notation and uniqueness.  Would be
nice if it is stable and shared across Linux distributions too, but I do
not thing anyone care about this at the moment. :)

I had a look, and in debian/control of
<URL: https://salsa.debian.org/debian-astro-team/indi-armadillo-platypus.git >
there is only one binary package listed.  Which other packages are you
talking about?

Note, to validate the appstream content you can use this oneliner after
building the package:

  appstreamcli validate-tree  --no-net --explain debian/indi-armadillo-platypus