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vJoySerialFeeder Process Interaction

Sometimes it may be useful to use the serial data available to vJoySerialFeeder for other purposes. In other cases you may want to command some axes or buttons from outside vJoySerialFeeder.

The classic example would be to develop a dashboard software. Let's say you built a cockpit with some sticks, levers, switches and you use Arduino to feed the data to vJoySerialFeeder. With the Interaction API you can create a dashboard (for example as a web page opened on a tablet) which visualizes some of the data coming through the serial channels. Furthermore you can make "soft" switches, buttons, axes on your dashboard which can be fed back to vJoySerialFeeder and from there to the virtual joystick.

General concepts

The Interaction capability allows data to be read and written from a running vJoySerialFeeder. Data is exchanged on per mapping basis.

Reading and Writing

Each mapping can be read and/or written to.

Reading

In general there are two ways to read data from a mapping:

  • Polling - you can request the Input and Output values anytime you need them

  • Events - you can subscribe to changes in the values of a mapping. There are two types of events:

    • Input events - these occur when the Input value of the mapping has changed.
    • Output events - these occur when the Output value of the mapping has changed.

    You can also subscribe to both kind of events at the same time.
    In most cases we care for the "output" type. For example, in Button Mappings we want to know when the button changes state (Output jumps to either 0.0 or 1.0) and we don't care about the actual Input which may be varying all the time.

Writing

You can set the Input and Output values of a Mapping yourself. If you modify the Input, Output will be automatically updated based on the Mapping's transformation rules.

Note: If you write to a mapping that is currently getting its input from a serial channel, your changes will be quickly overwritten. If you want to use a Mapping for writing you must assign it to channel 0 (see More about Mappings).

Interaction options

vJoySerialFeeder gives two options for process interaction:

  1. Microsoft COM
    Not to be confused with serial COM ports, this technology allows you to interact vJoySerialFeeder from any COM enabled application - for example: VBScript, AutoHotKey, etc. How-to.
  2. WebSocket
    Since web browsers are available on any PC you can use this option to quickly develop a HTML based dashboard. How-to.