Troubleshooting MQTT Binding - OH2

So, not sure why, but MQTT is not working anymore, and I’m not 100% sure how to troubleshoot.

I’ve removed and re-added the binding with the PaperUI. I’ve updated to the latest online build.

I can connect to the broker with a number of different clients and see messages flowing.

Any thoughts on how to ‘fonzi’ it to get it working again?

Some possibly-related errors:

2016-09-14 15:41:00.012 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_laundry_washer' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.013 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.015 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.016 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_laundry_washer' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.017 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_laundry_washer' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.028 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_sensor_washer_vibrations' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.030 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.032 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.034 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_sensor_washer_vibrations' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.035 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_sensor_washer_vibrations' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.045 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_moisture' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.047 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.048 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.049 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_moisture' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.050 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_moisture' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.053 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_rain' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.055 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.056 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.057 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_rain' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.058 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_rain' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.062 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_barrel' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.064 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.065 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.066 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_barrel' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:00.068 [ERROR] [ui.internal.items.ItemUIRegistryImpl] - Cannot retrieve item 'virtual_garden_barrel' for widget org.eclipse.smarthome.model.sitemap.Text
2016-09-14 15:41:57.423 [ERROR] [lipse.smarthome.io.net.http.HttpUtil] - Fatal transport error: java.nio.charset.UnsupportedCharsetException: "utf-8"
2016-09-14 15:41:57.424 [ERROR] [lipse.smarthome.io.net.http.HttpUtil] - Fatal transport error: java.nio.charset.UnsupportedCharsetException: "utf-8"
2016-09-14 15:41:57.478 [ERROR] [lipse.smarthome.io.net.http.HttpUtil] - Fatal transport error: java.nio.charset.UnsupportedCharsetException: "utf-8"

Eclipse Smarthome Designer is your friend. I’ve got to remember that!