How do I encode a Configuration Downlink For Water Leak Sensor?

How do I encode a Configuration Downlink For Water Leak Sensor?

NOTE:  All downlinks must contain a total of (8) bytes, padded with zeros at the end when necessary.

 Configuration Message: 0x08 
      Byte            Description
      0                  Downlink Message Type (0x08 = Water Leak Sensor)
      1                  Enable events for Water Leak Sensor
      2                  Threshold of relative resistance between probes (scale 0-255)
      3                  Restoral Margin in units of relative resistance between probes (scale 0-255)

The downlink configuration message for the sensor contains the resistance threshold for detecting the presence of a liquid.
The payload from the event message can be used to find the relative resistance of a given liquid.

The bit definitions for the disable events field are defined below.
     
Enable Event Bit Definitions (Byte #1)
      Bits            Description
      7:2             Unused
      1                To Enable water present message set to:  0 = yes, 1= no   
      0                To Enable water not present message set to: 0 = yes, 1= no

An alert is sent when the relative measurement increases above the defined threshold. The restoral margin requires that the measurement reduces by a certain amount below the threshold before another alert is triggered. Both the threshold and restoral margin are in units of relative resistance measurements on a scale of 0-255.

Water Leak Sensor Configuration Example:
      08 00 C8 0A 00 00 00 00
      08   Downlink Message Type (Water Leak Sensor = 0x08)
      00   Enable events for Water Leak Sensor
            0x00:
                  Water present message event = yes
                  Water not present event = yes
      50   Threshold of relative resistance between probes (0x50 = 80 = default)
      28   Restoral Margin in units of relative resistance between probes (0x28 = 40 = default)
      00    Not Used
      00    Not Used
      00    Not Used
      00    Not Used
                
If the configuration is successful the sensor will respond with a Downlink Acknowledge message:
            1 0 FF 02
            1                   Protocol Version (currently always 0x1)
            0                   Packet Counter, increments by 1 each message and wraps from 0xF to 0x0
            FF                 Message Type (Downlink ACK = 0xFF)
            02                 Downlink Message Valid (Invalid/Undefined = 0x01, Valid = 0x02)

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