http://dasl.mem.drexel.edu
SCP/Stargate Tutorial
Last Updated Tuesday, June 12, 2007 by Tony Le.


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  • Contents
  • Overview

    Keywords: stargate, wireless network, scp

    • This quick tutorial explains how to data record the auto-pilot data using the avionics code, convert it, and then how to get files from the Stargate. By using the PuTTY SCP protocol to access the Stargate and copy the files to a designated target directory.

    PuTTY Secure Copy client
    Release 0.60
    Usage: pscp [options] [user@]host:source target
    pscp [options] source [source...] [user@]host:target
    pscp [options] -ls [user@]host:filespec
    Options:
    -V print version information and exit
    -pgpfp print PGP key fingerprints and exit
    -p preserve file attributes
    -q quiet, don't show statistics
    -r copy directories recursively
    -v show verbose messages
    -load sessname Load settings from saved session
    -P port connect to specified port
    -l user connect with specified username
    -pw passw login with specified password
    -1 -2 force use of particular SSH protocol version
    -4 -6 force use of IPv4 or IPv6
    -C enable compression
    -i key private key file for authentication
    -noagent disable use of Pageant
    -agent enable use of Pageant
    -batch disable all interactive prompts
    -unsafe allow server-side wildcards (DANGEROUS)
    -sftp force use of SFTP protocol
    -scp force use of SCP protocol

  • Required Components

    All you need is SCP and wireless communication set up with the Stargate. You can find the Putty SCP version for Windows here: http://the.earth.li/~sgtatham/putty/latest/x86/pscp.exe.

  • Configure Stargate

    • Add the -save on command to the avionics code version 1.3+, adding the following option enables data recording to /mnt/cf1. For more informatin, enter the command avionics -help

      • avionics -save on

    • Data recording will continue as long as the avionics code is running. Note, that it is saved in three diffrent files:

      • gps.dat - GPS Data
      • imu.dat - IMU Data
      • nav.dat - Navigation Data

    • The three files are binary files. To decode them, use the decoder program that is apart of the avionics auto-pilot code. This program will decode the binary .dat files to .txt text files at the same location, /mnt/cf1

      • decoder

    • You can now copy the text files (gps.txt, imu.txt, nav.txt) to your computer using SCP.

  • Configure PC

    • The wireless communication should be set up as instructed in my Stargate Tutorial. To make sure that the connection is good, ping the Stargate from your PC. Ex: ping 192.168.11.102
    • Download the SCP executable and save it to a directory. Open your desired command prompt and navigate to the directory where you saved pscp.exe. With a properly configured connection to the Stargate use the following command:
    • The general form is: pscp user@hostname:source target
    • Here is an example execution:

      pscp root@192.168.11.102:/mnt/cf1/imu.txt .
      The server's host key is not cached in the registry. You have no guarantee that the server is the computer you think it is.
      The server's dss key fingerprint is:
      ssh-dss 1024 a2:5d:0a:7b:09:0b:7f:34:fa:25:32:5a:5f:64:ea:d5
      If you trust this host, enter "y" to add the key to
      PuTTY's cache and carry on connecting.
      If you want to carry on connecting just once, without
      adding the key to the cache, enter "n".
      If you do not trust this host, press Return to abandon the
      connection.
      Store key in cache? (y/n) y Enter y
      root@192.168.11.102's password: Enter Stargate password, ex: rootme

      imu.txt | 28 kB | 28.3 kB/s | ETA: 00:00:00 | 100%

    • The file has now been transferred to your active directory (.)

  • Useful Links