[homematic] Add hints about using docker (#14121)

Signed-off-by: Moritz 'Morty' Strübe <morty@gmx.net>

diff --git a/bundles/org.openhab.binding.homematic/README.md b/bundles/org.openhab.binding.homematic/README.md
index 965a9cc59b93fc22da2bf5148ae40941f690e7ab..2ee8cc43079718845a144d2cd87c505a9cee40e7 100644 (file)
--- a/bundles/org.openhab.binding.homematic/README.md
+++ b/bundles/org.openhab.binding.homematic/README.md
@@ -743,3 +743,9 @@ stop org.openhab.binding.homematic
 log:set TRACE org.openhab.binding.homematic
 start org.openhab.binding.homematic
 ```
+
+### Running in Docker
+
+First of all you need to map the `XML-RPC` and `BIN-RPC` Callback Ports to the outside world.
+They must not be mapped to a different port number.
+Next make sure that you set the `Callback Network Address` to the IP where the homematic can reach the exposed ports.