opportunistic-xbee/protocol.h

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#ifndef _PROTOCOL_H_
#define _PROTOCOL_H_
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#include <Wire.h>
#define DISCOVER_TTL 5000
#define SENDERID 42
#define MESSAGE_TTL 3
#define OPCODE_DISCOVER 0
#define OPCODE_MESSAGE 1
// discover request (c.f. class node)
#define DISCOVER_SIZE sizeof(uint8_t)*3
struct discover {
uint8_t opcode; // opcode = 0
uint8_t wave; // id de la wave
uint8_t dist; // current node's distance
};
#define MESSAGE_MIN_SIZE sizeof(uint8_t)*5
#define MESSAGE_MAX_SIZE (5 + 255) * sizeof(uint8_t)
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struct message {
uint8_t opcode; // opcode = 1
uint8_t sender; // sender id
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uint8_t dist; // distance of the last sender
uint8_t ttl; // time to live default = 10
uint8_t size; // size of message in bytes
uint8_t *data; // actual message
};
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#define PROTO_SIZE MESSAGE_MAX_SIZE
class Node{
private:
uint8_t wave = 0;
uint8_t dist = 255;
public:
getWave(){ return wave; }
getDist(){ return dist; }
bool update(uint8_t new_dist, uint8_t new_wave){
// ignore if already setup for this wave
if( new_wave == wave )
return false;
// update with new wave
//
// Note:
// - We consider that we will receive lowest dist(ance)
// in the first receive of each wave because of the XBee stack
wave = new_wave;
dist = new_dist+1;
return true;
}
};
#endif