Zigbee coordinator offline

  • Platform information:
    • Hardware: Raspberry Pi 3
    • OS: Raspbian
    • openHAB version: 2.4
  • Issue of the topic: please be detailed explaining your issue
    Zigbee coordinator not working and says “offline- communication error”

My Log says

nal.servlet.HABminApp] - Stopped HABmin servlet
2019-03-29 20:26:19.829 [INFO ] [assic.internal.servlet.WebAppServlet] - Stopped Classic UI
2019-03-29 20:26:20.817 [INFO ] [arthome.ui.paper.internal.PaperUIApp] - Stopped Paper UI
2019-03-29 20:26:20.857 [INFO ] [panel.internal.HABPanelDashboardTile] - Stopped HABPanel
2019-03-29 20:26:20.867 [INFO ] [ebuilder.internal.HomeBuilderServlet] - Stopped Home Builder
2019-03-29 20:26:20.895 [INFO ] [.dashboard.internal.DashboardService] - Stopped Dashboard
2019-03-29 20:26:21.013 [WARN ] [.core.thing.binding.BaseThingHandler] - Handler EmberHandler of thing zigbee:coordinator_ember:a2535bb2 tried updating channel rx_dat although the handler was already disposed.
2019-03-29 20:26:21.016 [WARN ] [.core.thing.binding.BaseThingHandler] - Handler EmberHandler of thing zigbee:coordinator_ember:a2535bb2 tried updating channel tx_dat although the handler was already disposed.
2019-03-29 20:26:48.778 [INFO ] [.internal.GenericScriptEngineFactory] - Activated scripting support for ECMAScript
2019-03-29 20:26:52.747 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Location set to ‘-’.
2019-03-29 20:26:52.764 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Locale set to ‘en_US’.
2019-03-29 20:26:52.775 [INFO ] [ebuilder.internal.HomeBuilderServlet] - Started Home Builder at /homebuilder
2019-03-29 20:26:53.342 [INFO ] [panel.internal.HABPanelDashboardTile] - Started HABPanel at /habpanel
2019-03-29 20:27:39.948 [INFO ] [thome.model.lsp.internal.ModelServer] - Started Language Server Protocol (LSP) service on port 5007
2019-03-29 20:27:42.837 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading model ‘home.sitemap’
2019-03-29 20:27:44.767 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading model ‘home.things’
2019-03-29 20:27:45.977 [INFO ] [g.discovery.internal.PersistentInbox] - Added new thing ‘wifiled:wifiled:-’ to inbox.
2019-03-29 20:27:50.514 [INFO ] [.dashboard.internal.DashboardService] - Started Dashboard at http://-:8080
2019-03-29 20:27:50.518 [INFO ] [.dashboard.internal.DashboardService] - Started Dashboard at https://-:8443
2019-03-29 20:27:51.174 [INFO ] [arthome.ui.paper.internal.PaperUIApp] - Started Paper UI at /paperui
2019-03-29 20:27:52.605 [INFO ] [ui.habmin.internal.servlet.HABminApp] - Started HABmin servlet at /habmin

Probably the serial port can’t be opened, but the log doesn’t really provide much information, it you want to know more, it would be worth getting a debug log as described in the docs.