At this page we collect example configurations for the OpenHAB integration of smarthomatic devices. using the Smarthomatic-Binding published at Github. Some example configurations can be found there as well.

Based on the EnvSensor the short between a GPIO-PIN and GND or a special switch can be used as a water detection sensor.

The item definition on OpenHAB (the contacts are mapped in e2p to the third port):

Switch	Water_Basement	"Water sensor basement [MAP(water.map):%s]"	(gBasement,gSensorWater,gSensor) {smarthomatic="<[deviceId=123, messageGroupId=1, messageId=1, messagePart=2]"}

The water.map file:

ON=dry
OFF=wet
-=??

The rule to send a mail if a short between the pins is connected:

val String mailTo = mymail@server.com

rule "water detection"
  when
    Item gSensorWater received update
  then
    // check for any water detection sensors in the house that are activated (OFF state = closed = wet)
    if (! gSensorWater.allMembers.filter([state == OFF]).empty) {
      logInfo("sensor.rules", "Water alarm tripped by short detection sensor!")
      Alarm_Water.postUpdate(ON)
    }
  end

rule "water alarm"
  when
    Item Alarm_Water received update ON
  then
    report = gSensorWater.allMembers.map[name + ": " + state].join("\n") 
    val message = "A water sensor was activated!!! \n\nsensor status:\n" + report + "\n\n regards, OpenHab"

   sendMail(mailTo, "WATER ALARM!!", message )

  end