mqttx simulate device access

1. Device Reporting Flow

1. Download and install the MQTTX tool. After installation, view the device authentication information on the platform.
   

2. After the simulated device connects, perform a device data reporting test. For the data reporting format, refer to the MQTT device access documentation under the documentation section.
   

2. Platform Command Issuing

Configuring the Receiving Topic

Platform Issuing