ICG Server
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Changed: ICG sends now keep-alive packages to the devices (only for IGEL OS firmware 11.05.131 and higher) to detect and close dead websockets and forward the offline state of the device to UMS.
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Added: REST endpoint to test the status of the ICG.
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Changed: Updated bundled Zulu JRE from version 8u282 to 8u302.
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Changed: Updated Spring Boot to version 2.5.6 (embedded Tomcat version 9.0.54).