[Tinyos-help]:is SerialForwarder is needed when start BcastInject

[Renee Azhen]

dear all,
  when I am studying the Tutorial 7, I have two questions:
  1. Do I need to run SerialForwarder?? 
      In tutorial, it said I should run SerialForwarder first, and then run   
      net.tinyos.tools.BcastInject <group_id> <command>, but if I do both of them, an error occured, which told me:
  serial at COM9:19200 died - exiting (java.io.IOException: Port COM9 busy)? 
  I looked up in the mailing list archive, I think maybe the tutorial is out of date, and I don't need to run SerialForwarder if I am to run BcastInject. Am I right?
   
  2. How to find the COM# number?
   



       
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