The following document shows all the errors that can appear in the IoTAgent Ultralight 2.0 log file, and gives a brief idea of the severity and how to react to those errors.
Take into account that this Agent uses the IoT Agent Library for Node.js, and so can raise its alarms and log errors in addition to those particular of this agent. More information about those can be found in the IoT Agent Library Operations Manual.
The following section contains the error log entries that can appear in the IoTA logs, grouped by category.
Indicates that a command has been received for a non-registered entity. This could mean the device was removed from the IoT Agent without removing the registration in the Context Broker. Check for the existence of a provisioned device for the entity, and, if it doesn't exist, remove the Context Broker registration for that unexistent device.
Indicates that there was no APIKey defined for the provisioned device targeted by a command. This error log should never
happen in production, as there should be a default APIKey configured for devices not belonging to a Configuration. If it
does happen, check the configuration property defaultKey.
COMMANDS-003: Couldn't update command status in the Context broker for device [%s] with apiKey [%s]: %s
There was some communication error connecting with the Context Broker that made it impossible to update the command status. If this error appears, the command status will be left inconsistent. If this log appears frequently, it may be a signal of network problems between the IoTAgent and the Context Broker. Check the IoTAgent network connection, and the configured Context Broker port and host.
There was a problem sending the command to a device. If this error happens occasionally and just with one device, it may indicate a problem with that particular device (broken connectivity, device shutdown, etc.). If it happens frequently it will indicate a IoTAgent problem with the South Bound connectivity.
This error log indicates that a connectivity problem happened when the IoT Agent was trying to report an error sending information to a device. If this log appears, it means the IoTAgent has problems both in the Northern and Southern network interfaces, and it most probably indicates a general network accesing problem for the IoTA.
This error log will appear whenever a measure arrives to the IoTAgent for a device that has not been provisioned or for an API Key that has not been registered in the IOTAgent. This could have several origins: the may be a typo in the DeviceId or APIKey used by the customer; or either the Configuration or the Device for the corresponding measure may have been removed; or the customer may have forgotten to provision both the Configuration and the Device.
There was some communication error connecting with the Context Broker that made it impossible to send the measures. If this log appears frequently, it may be a signal of network problems between the IoTAgent and the Context Broker. Check the IoTAgent network connection, and the configured Context Broker port and host.
Implies a message was received in an invalid MQTT Topic. Normally, this is an error that can only be addressed by the client itself.
This error will be risen when the IoTA is processing a set of MQTT measures, but cannot find the device they belong to. Usually will be caused by unprovisioned or ill-provisioned devices.
Error subscribing the IoT Agent to the appropriate MQTT Topics. This error can only happen at startup time, and should prevent the IOTA from starting. If this error occurs, check the Mosquitto MQTT broker is up and running and check the connectivity from the IoTAgent to the broker.
This fatal error will be risen when the IOTAgent cannot make the initial connection to the Mosquitto MQTT broker. If this error occurs, check the Mosquitto MQTT broker is up and running and check the connectivity from the IoTAgent to the broker.
The following table shows the alarms that can be raised in the Ultralight 2.0 IoTAgent library. All the alarms are
signaled by an error log starting with the prefix Raising %s: (where %s is the alarm name). All the alarms are
released by an info log with the prefix Releasing [%s]. These texts appear in the msg= field of the generic log
record format.
| Alarm name | Severity | Description |
|---|---|---|
| MQTTB-ALARM | Critical | Indicates a persistent error accessing the Mosquitto MQTT Broker |
while the 'Severity' criterium is as follows:
- Critical - The system is not working
- Major - The system has a problem that degrades the service and must be addressed
- Warning - It is happening something that must be notified
Every error has a code composed of a prefix and an ID, codified with the following table:
| Prefix | Type of operation |
|---|---|
| GLOBAL | Global errors |
| MEASURES | Errors related with measure processing |
| COMMANDS | Errors related with command processing |