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beremiz

Runtime: work around 1s delay added when using twisted reactor's callLater.
wxPython4
2022-10-05, Edouard Tisserant

c3aae4c95bc1

Runtime: work around 1s delay added when using twisted reactor's callLater.

Since wxPython4, using wxReactor from non-main thread was producing
exceptions in wxWidget's C++ code. Then reactor.run() was called from
main thread, and runtime's worker was delegating calls to reactor
with callLater(0, callable).

While this worked perfectly with wxReactor, it did introduce an unexplained
1 second delay to each worker call when using nomal linux reactors
(i.e. without wxPython). As a workaround reactor runs in a thread when using
twisted without wxPython

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<contentHeader name="WAMPTest" modificationDateTime="2018-08-27T11:11:30">

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<xhtml:p><![CDATA[Communication between Beremiz and PLC runtime isn't bound to any specific protocol and could be extended by writing corresponding connector (see 'connectors' directory).

Beremiz reference runtime implementation supports PYRO and WAMP protocols.

This example shows how to use Web Application Messaging Protocol (WAMP).

WAMP can be used to build distributed systems out of application components which are loosely coupled and communicate in real-time. No direct connection between IDE and PLC are necessary.

WAMP is in a process to be published as official IETF standard. Draft specification is already available on IETF website.

To use this example you need WAMP router and standalone running Beremiz_service.

1. See README file in project's directory with detailed instructions for

setup Crossbar.io, router for open Web Application Messaging Protocol (WAMP).

2. Run crossbar

3. Create service working directory and copy wampconf.json from project_files to created directory

4. Run Beremiz_service:

./Beremiz_service.py -x 0 <working directory>

]]></xhtml:p>

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