Sequence Diagram

Best case scenario

4    3    2    1    BASE
                        
R    R    R    R    |
PU   PU   PU   PU   |
F<-->F<-->F<-->F--->|
P<---P<---P<---P<---|
               TX-->|
          TX-->TX-->|
     TX-->TX-->TX-->|
TX-->TX-->TX-->TX-->|
PD   PD   PD   PD   |

Communication failure scenario

4    3  | 2    1    BASE
        |               
R    R  | R    R    |
PU   PU | PU   PU   |
F<-->F  | F<-->F--->|
S    S  | P<---P<---|
PD   PD |      TX-->|
        | TX-->TX-->|
        | PD   PD   |

Key

• R = Read Sensor Data (multiple)
• PU = Power up radio
• F = Flood - Broadcast ID to all nearby nodes
• P = Prune - Work out shortest distance to sink
• TX = Transmit sensor data
• S = Store data locally
• PD = Power down radio