In this video Tom Edworthy goes through the implementation of a wireless IoT rain sensor system using the mc-Module 110 (also compatible with the mc-Module 120).  Near the end of this video demonstration Tom shows the system in action by sending response data through the MQTT IoT app for Android.

https://youtu.be/Uxry7aGb2V4

Links to both the rain sensor and MQTT Iot app below:

Rain Sensor:
http://ebay.to/2ewel62 (eBay)
http://bit.ly/2dJmu80 (Wish)
http://bit.ly/2f8dRVE (Deal Extreme)

MQTT IoT Phone App:
http://bit.ly/2eS6Fcs (Google Play)

Simple Code:
Define PinMode Pin0 As AnalogInput Alias RainLevel
Define PinMode Pin6 As DigitalOutput Alias enableRainLevel
Class RainSensor   
    Shared Event measureRainLevel2() RaiseEvent Every 30 Seconds
       
        enableRainLevel = True 'turn on voltage divider
        Thread.Sleep(40000) 'sleep 40ms for voltage to stabilize
        Dim voltage As Short = RainLevel
        Dim payload As ListOfByte = New ListOfByte
        Dim payString As String = ""
        If voltage > 1076 Then
            payString = "Dry"
        ElseIf voltage <= 1075 Then               
            payString = "Raining/Wet"
        Else
        End If
       
        enableRainLevel = False 'turn off voltage divider
        payload.Add(payString)
        Lplan.Publish("mcThings/RainLevel2", payload)
    End Event
    'the following will check the battery voltage and will alert if low via IFTTT
    Shared Event measureVoltage() RaiseEvent Every 12 Hours
       
        Dim BattVolt As Short = Device.BatteryVoltage
       
        If BattVolt < 2200 Then
            Lplan.IFTTT("YOURIFTTTKEYHERE", "RainSensor2Batt")
        Else
           
        End If
       
    End Event
End Class
Complex Code:
Define PinMode Pin0 As AnalogInput Alias RainLevel
Define PinMode Pin6 As DigitalOutput Alias enableRainLevel
Class RainSensor   
    Shared Event measureRainLevel() RaiseEvent Every 30 Seconds
       
        enableRainLevel = True 'turn on voltage divider
        Thread.Sleep(40000) 'sleep 40ms for voltage to stabilize
        Dim voltage As Short = RainLevel
        Dim payload As ListOfByte = New ListOfByte
        Dim payString As String = ""
        If voltage > 1076 Then
            payString = "Dry"
        ElseIf voltage <= 1075 And voltage >= 801 Then
            payString = "LightRain"             
        ElseIf voltage <= 800 And voltage >= 651 Then
            payString = "MediumRain"               
        ElseIf voltage < 650 Then
            payString = "HeavyRain"
        Else
        End If
       
        enableRainLevel = False 'turn off voltage divider
        payload.Add(payString)
        Lplan.Publish("mcThings/RainLevel", payload)
    End Event
    'the following will check the battery voltage and will alert if low via IFTTT
    Shared Event measureVoltage() RaiseEvent Every 12 Hours
       
        Dim BattVolt As Short = Device.BatteryVoltage
       
        If BattVolt < 2200 Then
            Lplan.IFTTT("YOURIFTTTKEYHERE", "RainSensorBatt")
        Else
           
        End If
       
    End Event
End Class