Need to read a simple string stream from an IP address
lazarus / 66-Unix

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AlanTheBeast · 2016-09-25 17:47

Hi,

I don't use Lazarus, just FPC command line (via Lightweight).

I have a nifty app on my iPhone called SensorLog and it will output
whatever sensor data from the phone one sets up to an IP address and a
set port.  I can telnet that to the terminal such as

$ telnet 192.168.1.22 60444
or
$ telnet 192.168.1.22 60444 > a_file.csv

but I can't get a named pipe or directed pipe to read in the stream.

Is there some "light" unit that will allow me to read the stream?

Something like

     - set an IP address and port as a textfile or a stream
     - read from it until dizzy
     - close when done


Thanks

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Phil · 2016-09-25 17:51

Not sure if I follow.

Does an HTTP request using FPC's TFPHTTPClient class work?
(fphttpclient unit)

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AlanTheBeast · 2016-09-25 22:51

I don't know Phil - but now that you've pointed me at that unit I'll
see what I see!

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Phil · 2016-09-25 23:00

I might have misunderstood what you're doing.

Are you using telnet on a computer as a way to read from the iOS app
sends?

I think that for an HTTP request to work, the iOS app would need to
act like a Web app running under a Web server. That is, when it
receives a request for data, it returns it in a response. From the
description on the app store, it appears as though it SensorLog can do
that:

https://itunes.apple.com/us/app/sensorlog/id388014573?mt=8

I believe iOS includes a Web server (Apache) because I've seen an iOS
app that works like a Web app. Perhaps SensorLog is using the server
to service the HTTP requests.

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Thaddy · 2016-09-26 04:30

Http should work since it is explicitly supported by SensorLog. see
docs in appstore that reads: per HTTP GET/POST.

In that case it should be very easy with TFPHttp and trivial with
synapse.

[edit]
The httpget example in /packages/fcl-web/examples/httpclient/ works
straight out of the box, tested against an apache server.
usage: httpget <url> <filename>

With synapse use:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i function
HttpGetText(const URL: string; const Response: TStrings): Boolean;//
in httpsend.pas
There's TCP/IP only streaming client example in this blogpost by forum
member leledumbo:
http://pascalgeek.blogspot.nl/2012/06/encryption-decryption-and-
asynchronous.html
Scroll-down a bit.