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  • The speed of the testbed is less important than robustness and reliability.
  • Packet radios connect to a computer through USB, which is emulated as a serial port.
  • All packet radios don’t necessarily need to be connected to the same computer, however the code presented below assumes that it is. It also provides the most value added when they are connected to the same computer, as results can be grouped together easily, and script files are easier to maintain.
  • The computer is powerful enough to handle the threading utilised.
  • There is sufficient disk space for log files.
  • The packet radio addresses range from 1 to 254. Address 0 is forbidden, and address 255 (or 0xFF) is reserved for broadcast.
  • Symbolisation is a form of physical layer emulation.
  • As soon as a node’s send counter hits a predefined maximum number of retries, the node will drop the packet and continue sending the next packet. The node does not abort the entire transmission if one packet fails.
  • Sink/receiver packet handling is based on the assumption that sources do not change their application at any time – for example, in a receiver that is currently receiving packet generator packets from a sender, it does not expect the sender suddenly to start sending chat messages. If this were to occur, there is a moderately high chance of unexpected behaviour at the receiver.
Topic revision: r2 - 2012-01-18 - XiaohongWu
 
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