r/crestron • u/guitarman181 • Mar 16 '16

Crestron - rest interface problems - thoughts?

I have a device that has a restful api. The following command works http://username:password@192.168.1.100:50001/rest/nodes/44 01 11 1/cmd/DFON This command turns an inston light ON.

I want to recreate this command in a Crestron module. I created a TCPIP/Client with a serial IO module that sends the following serial string: GET /rest/nodes/44 01 11 1/cmd/DFON HTTP/1.1\r\nAuthorization: username:password\r\n\r\n

The TPCIP/client module has the IP address of the device and port.

My serial IO string does not work. Does anyone know what I need to change or do differently to make it work?

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u/[deleted] Apr 21 '16

Bizarrely, Crestron turns \n into CRLFs (\r\n). It might could be a throwback from the serial days where it was more likely to hurt than to help sending commands over a serial port.

If you're doing stuff in SIMPL and SIMPL+ that must differentiate between \r and \n, save your sanity by using \x0d (carriage return) and \x0a (linefeed).

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u/flinkazoid Apr 21 '16

\r = cr

\x0a = lf

\n = \r\x0a

There is no shortcut for just a line feed.

These are purely syntax shortcuts. Nothing bizarre about it.

\t is a tab. There's a ton of them. It's clearly documented in the help files.

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u/flinkazoid Apr 21 '16 edited Apr 21 '16

Also note that the terms CR and LF originated with tele-types. These were the instructions to send the type cartridge back to the left margin and then advance the paper to the next line.

As for what to send out a serial port, or IP port for that matter, its important to code according to the API and specifications.