Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>If it is a single device, you should use a solution that handles the low-level <code>socket</code> interactions for you... python has several like <a href="http://www.noah.org/wiki/pexpect" rel="nofollow noreferrer"><code>pexpect</code></a>, <a href="https://github.com/knipknap/exscript/wiki" rel="nofollow noreferrer">exscript</a>, or <a href="http://www.lag.net/paramiko/" rel="nofollow noreferrer"><code>paramiko</code> (ssh only)</a>... if it is multiple devices and you need asynchronous communication, use @zeekay's answer (although async programming, particularly with twisted, is unpleasant if you're not already familiar with it).</p> <p>I answered a question with the way you telnet and send a list of commands to a single device here...</p> <p><a href="https://stackoverflow.com/questions/5602080/catching-a-dying-process-in-pexpect/5602629#5602629">Catching a dying process in pexpect</a></p> <p>The answer above makes the code efficient, but is more challenging for a beginner to understand... the following code is simpler, it makes a telnet connection on TCP/23, waits for <code>*</code>, sends a command, and puts the response to the command in <code>mydata1</code>...</p> <pre><code>import pexpect as px import sys def send_this(child, retcode, COMMAND): if retcode == 2: child.sendline(COMMAND) else: raise RuntimeError, "Could not complete login, due to socket error" def expect_this(child, EXPR, timeout = 10): return child.expect([px.TIMEOUT, px.EOF, EXPR], timeout = timeout) HOST = '192.168.49.49' CMD1 = '1I' PROMPT = '\*' #Note: you might not need the backslash TIMEOUT = 10 child = px.spawn('telnet %s' % HOST) retcode = expect_this(child, PROMPT) send_this(child, retcode, CMD1) retcode = expect_this(child, PROMPT) mydata1 = child.before # mydata has the output from CMD1 </code></pre> <p>Regardless of the solution, the most important thing is tweaking your timeouts so you don't have to concern yourself with the long cell-network delays (which are sometimes over 5 seconds in my experience).</p> <p>The other nasty dynamic in cellular communication is that many consumer devices <em>routinely</em> change their IP address when they are moving (due to their reliance on dhcp)... there isn't much TCP can do if this happens... if you don't have a static address the connection will drop when the device pulls a new ip address.</p>
    singulars
    1. This table or related slice is empty.
    1. POPython: Socket: Handling TCP connections over a cell network
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USMike Pennington
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POPython: Socket: Handling TCP connections over a cell network
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COThe device has static IP. I am reading `pexpect` right now and it seems pretty hard to digest since I never coded in python before. This is actually my 1st time ever :)
      singulars
      1. PO
      1. USTu Hoang
    2. CO@Tanner, if this is your first endeavor coding in python, handling TCP sockets with the `socket` module isn't much more pleasant... I will post a simple script for you... are you using windows, osx, or linux?
      singulars
      1. PO
      1. USMike Pennington
    3. CO@Mike Pennington: I am using Linux, python 2.7.2
      singulars
      1. PO
      1. USTu Hoang
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload