How do I encode a downlink for a Dry Contact Sensor?

How do I encode a downlink for a Dry Contact Sensor?

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


Configuration Example:
      07 00 00 08 04 B0 00 00
      07              Downlink Message Type (0x07 = Dry Contact Sensor)
      00              Enable Shorted and Open Hold Time Event Messages
                        0x00 
                               Enable Reporting For Contact Short = Yes
                               Enable Reporting For Contact Open = Yes
      0008          Set hold time for Contact Shorted Events (0x08 = 8 -> 8*250ms = 2 seconds)
      04b0          Set hold time for Contact Shorted Events (0x04B0 = 1200 -> 1200*250ms = 300seconds = 5 minutes)
      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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