tranform on/off (HomeMatic/MAX desiredTemp)

local/share/check_mk/checks/fhem

@@ -337,6 +337,11 @@ def check_fhem(item, params, info):
 
                             ## define perfdata (just add numeric values)
                             if perfd and not fetch_plain:
+                                ## transform on/off (HomeMatic/MAX desiredTemp)
+                                if value == "on":
+                                        value = 100
+                                if value == "off":
+                                        value = 0
                                 perfdata.append( ( title, value, upper_warn, upper_crit, "", "" ) )