diff --git a/tests/getsupporteddevices.sh b/tests/getsupporteddevices.sh
index 7e2d9c34..c717ef5c 100755
--- a/tests/getsupporteddevices.sh
+++ b/tests/getsupporteddevices.sh
@@ -1,3 +1,7 @@
 #!/bin/bash
 
-(echo '{"id":1, "method":"Devices.GetSupportedDevices"}'; sleep 1) | nc 10.10.10.114 1234
+if [ -z $1 ]; then
+  echo "usage $0 host"
+else
+  (echo '{"id":1, "method":"Devices.GetSupportedDevices"}'; sleep 1) | nc $1 1234
+fi