Mote Serial Message Interface

The mote network will produce the packets described below for the serial interface for Day 0. Each data packet contains the sensor information from a single mote that is uniquely identified by the original_mote_address. The data from all four sensors are placed in the sens_data array using run length encoding. The data from each sensor is separated by a terminator.

Packet Length = 76 bytes

#define MAX_READINGS_IN_PACKET 35

Data Packets

char addr; // can ignore

char type; // type of packet

unsigned char group; // group number

char original_mote_address; // mote where packet originated from

char send_num; // the number of times this packet has been sent

char seq_num; // the sequence numbers

sens_reading sens_data[MAX_READINGS_IN_PACKET]; // sensor readings

typedef struct{

unsigned char reading;

unsigned char frequency;

} sens_reading;

If type = 4 normal data packet

Else if type = 6 getting low on power need charging soon or will be dead

Else if type = 7 the robot is currently present and charging me

Data is ordered:

Photo Data

Terminator

Temperature Data

Terminator

Moisture Data

Terminator

Power Data

Terminators fill in any extra bytes

A terminator is equal to a reading = 0 and frequency = 0.

Notes:

1) The “seq_num” is a sequence number that ranges from 0-15. All packets should be delievered in order.

2) The “send_num” is the the amount of times the packet had to be resent