More canonical test.
There is an exception happening around here in some cases when connection is dropped while waiting for answer. Not sure that this fixes it but this is anyhow better.
<?xml version='1.0' encoding='utf-8'?>
<project xmlns="http://www.plcopen.org/xml/tc6_0201" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xhtml="http://www.w3.org/1999/xhtml" xsi:schemaLocation="http://www.plcopen.org/xml/tc6_0201">
<fileHeader companyName="Beremiz" productName="Beremiz" productVersion="1" creationDateTime="2012-09-12T23:30:19"/>
<contentHeader name="Wiimote example" modificationDateTime="2017-06-06T13:10:31">
<coordinateInfo>
<fbd>
<scaling x="5" y="5"/>
</fbd>
<ld>
<scaling x="0" y="0"/>
</ld>
<sfc>
<scaling x="0" y="0"/>
</sfc>
</coordinateInfo>
</contentHeader>
<types>
<dataTypes/>
<pous>
<pou name="main" pouType="program">
<interface>
<localVars>
<variable name="x">
<type>
<INT/>
</type>
</variable>
<variable name="y">
<type>
<INT/>
</type>
</variable>
<variable name="a">
<type>
<INT/>
</type>
</variable>
<variable name="b">
<type>
<INT/>
</type>
</variable>
<variable name="c">
<type>
<INT/>
</type>
</variable>
<variable name="b1">
<type>
<WORD/>
</type>
</variable>
<variable name="b0">
<type>
<WORD/>
</type>
</variable>
</localVars>
<externalVars>
<variable name="WiiNunchuckStickX">
<type>
<INT/>
</type>
</variable>
<variable name="WiiNunchuckStickY">
<type>
<INT/>
</type>
</variable>
<variable name="WiiNunchuckButtons">
<type>
<WORD/>
</type>
</variable>
<variable name="WiiButtons">
<type>
<WORD/>
</type>
</variable>
<variable name="WiiNunchuckAccX">
<type>
<INT/>
</type>
</variable>
<variable name="WiiNunchuckAccY">
<type>
<INT/>
</type>
</variable>
<variable name="WiiNunchuckAccZ">
<type>
<INT/>
</type>
</variable>
</externalVars>
</interface>
<body>
<FBD>
<outVariable localId="1" height="30" width="20">
<position x="345" y="40"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="3">
<position x="345" y="55"/>
<position x="295" y="55"/>
</connection>
</connectionPointIn>
<expression>x</expression>
</outVariable>
<inVariable localId="3" height="30" width="150">
<position x="145" y="40"/>
<connectionPointOut>
<relPosition x="150" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckStickX</expression>
</inVariable>
<inVariable localId="4" height="30" width="150">
<position x="145" y="100"/>
<connectionPointOut>
<relPosition x="150" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckStickY</expression>
</inVariable>
<inVariable localId="5" height="30" width="155">
<position x="115" y="175"/>
<connectionPointOut>
<relPosition x="155" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckButtons</expression>
</inVariable>
<inVariable localId="6" height="30" width="90">
<position x="180" y="225"/>
<connectionPointOut>
<relPosition x="90" y="15"/>
</connectionPointOut>
<expression>WiiButtons</expression>
</inVariable>
<outVariable localId="8" height="30" width="20">
<position x="345" y="100"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="4">
<position x="345" y="115"/>
<position x="295" y="115"/>
</connection>
</connectionPointIn>
<expression>y</expression>
</outVariable>
<outVariable localId="9" height="30" width="30">
<position x="345" y="175"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="5">
<position x="345" y="190"/>
<position x="270" y="190"/>
</connection>
</connectionPointIn>
<expression>b1</expression>
</outVariable>
<outVariable localId="10" height="30" width="30">
<position x="345" y="225"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="6">
<position x="345" y="240"/>
<position x="270" y="240"/>
</connection>
</connectionPointIn>
<expression>b0</expression>
</outVariable>
<inVariable localId="11" height="30" width="135">
<position x="135" y="295"/>
<connectionPointOut>
<relPosition x="135" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckAccX</expression>
</inVariable>
<inVariable localId="12" height="30" width="135">
<position x="135" y="340"/>
<connectionPointOut>
<relPosition x="135" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckAccY</expression>
</inVariable>
<inVariable localId="13" height="30" width="130">
<position x="140" y="385"/>
<connectionPointOut>
<relPosition x="130" y="15"/>
</connectionPointOut>
<expression>WiiNunchuckAccZ</expression>
</inVariable>
<outVariable localId="14" height="30" width="20">
<position x="345" y="295"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="11">
<position x="345" y="310"/>
<position x="270" y="310"/>
</connection>
</connectionPointIn>
<expression>a</expression>
</outVariable>
<outVariable localId="15" height="30" width="20">
<position x="345" y="340"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="12">
<position x="345" y="355"/>
<position x="270" y="355"/>
</connection>
</connectionPointIn>
<expression>b</expression>
</outVariable>
<outVariable localId="16" height="30" width="20">
<position x="345" y="385"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="13">
<position x="345" y="400"/>
<position x="270" y="400"/>
</connection>
</connectionPointIn>
<expression>c</expression>
</outVariable>
<comment localId="17" height="125" width="500">
<position x="450" y="30"/>
<content>
<xhtml:p><![CDATA[This example shows interaction of PLC program with Nintendo Wii Remote controller.
To work this example requires python-cwiid library to be installed.]]></xhtml:p>
</content>
</comment>
</FBD>
</body>
<documentation>
<xhtml:p><![CDATA[]]></xhtml:p>
</documentation>
</pou>
</pous>
</types>
<instances>
<configurations>
<configuration name="config">
<resource name="resource1">
<task name="tsk1" interval="T#1ms" priority="0">
<pouInstance name="inst1" typeName="main"/>
</task>
</resource>
</configuration>
</configurations>
</instances>
</project>