Message Publisher Simulator is an application that helps in simulating a single device communication with IoT Hub, or any other message publisher that sends messages/events to Azure EventGrid and/or Azure ServiceBus. It is possible to define JSON payload, and trigger message sending. Message sending can be also time triggered.

Message Publisher Simulator can work as the device simulator. It supports device-to-cloud communication, direct-method communication, and cloud-to-device communication. In order to enable communication, the connection string needs to be provided.

Message Publisher Simulator can send events to the event grid topic. In order to enable communication, the following parameters need to be provided:

• endpoint URL
• access key
• topic name
• subject
• data version
• event type.

Currently, it works only with Event Grid schema.

Message Publisher Simulator can send events to the service bus queue/topic. In order to enable communication, the following parameters need to be provided:

• connection string
• queue/topic name
• select if the target is either queue or topic.

It is possible to use the expression for generating random value(double or int). It is necessary to include the keyword "rnd" followed by min and max value separated with ":". For example:

{
   "Name":"Temperature",
   "Timestamp":"2016-12-31T01:00:03",
   "Value":"rnd:25.0:30"
}

If min or max value contains a comma, the randomly generated value will be double, otherwise int.

Message Publisher Simulator is UWP(min version 1809, build 17763) application based on MVVMCross 6.x. The intention with cross-platform development is to offer simulator for MAC OS, iOS and Android in the near future.

• MAC OS version of the application
• Extend the expression to support adding timestamp instead of hardcoding in the message payload