Adjustment of app.sh

app.sh

 # run the backend module
 
-python -m capice_compute.backend listen
+if [[ -v DE_MESSAGING_ENV_FILE ]]; then
+
+  source $DE_MESSAGING_ENV_FILE
+
+  python -m capice_compute.backend \
+    --topic "$DE_BACKEND_TOPIC" \
+    --header "$DE_BACKEND_HEADER" \
+    --websocket-url "$DE_BACKEND_WEBSOCKET_URL" \
+      listen
+
+else
+  python -m capice_compute.backend listen
+fi