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HTTP Device Core

The HTTP Device Core for Blue Pill, core-protocol-http, allows users to send and to some extend receive and process information via HTTP requests. Effectively, this can help to bridge communication with devices with RESTful APIs where a dedicated device core is not available.

The device core has a basic mode and some more complex features that can come in handy in some cases. It has been designed to align with the feature set of the corresponding HTTP Client device core on the UniSketch platform, but it's far more robust and easy to extend to include new approaches.

Basic Configuration


Commands

The commands you can specify and send are ASCII by default and exactly what you see in the string will be sent as ASCII, unless:

  • \n and \r will send a newline or carriage return (bytes 10 and 13)
  • \xHH will send a byte with the value HH (in hex): so \xFF will send a byte with value “255”

  • \p1 or \p2 (alternatively \d1, \d2, \h1, \h2) will insert a parameter value as defined by the meta value p1 and p2 in the device core parameters Toggle, On Trigger and Off Trigger.
    The difference of using \p, \d and \h is whether the meta value is inserted as the byte value (\p), inserted as a decimal number like “255” or “37” or “3” (\d - there is no leading zeros) or in hexadecimal like FF or D0 or 00 (\h - in this case it’s always two characters and uppercase).

Example

Say you want to send a command to fire DMEMs on GVG100, in that case you want to send the text string “03 01 DB 00” to fire DMEM 01, send “03 01 DB 01” to fire DMEM 02 etc.
So setting up a command like “03 01 DB \h1” and then using the “p1” meta value through a constant in Reactor would allow you to distribute the same behavior across multiple hardware components on a panel but vary the Dmem value easily.

Testing and tools

An advice is to use the "ipserver" binary tool provided by SKAARHOJ to set up a server to help testing the functionality until you are confident that everything works as expected and would function with the final target device.

Basic Configuration

 

The device core has some configuration fields:

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