Sensor message format (on top of UDP):

Version

Application

Packet Type

Node ID

SEQ number

Driver ID

Payload

Where

• Version
  • Protocol Version
  • one byte unsigned integer
  • Equal to one for this version
• Application
  • application specific distinct pattern
  • four bytes
• Packet Type (list of packet types)
  • type of packet, interpretation of rest of packet
  • two byte unsigned integer
• Node ID – identity of sensor node (from / to)
  • two byte unsigned integer
• SEQ Number
  • sequence number for each sent or received packet. The touple <ID, SEQ number> is unique for each message (GET or SET). For ACKs is the SEQ Number of the packet being ACKed. *SEQ Number is a two bytes unsigned integer
• Driver ID
  • identification for the driver
  • list of driver IDs?
  • the drivers IDs are mapped to UDP port numbers (driver UDP port = DRIVER_BASE_PORT + driver_ID)
• Payload is from/to the drivers, specified here