Device Connection Using MQTT.fx

This topic describes how to connect a device to the Tuya IoT Development Platform over MQTT, using the software MQTT.fx as an example.

Prerequisites

Log in to the Tuya IoT Development Platform and create a product to get the following parameters. For more information about the detailed processes of product creation, see Create Products.

Example

MQTT.fx configuration

1. Download the MQTT.fx software from its official website.

2. Open MQTT.fx. Click Extras and choose Edit Connection Profiles.

   

3. Complete the required information on the Edit Connection Profiles page.

   

   Parameter	Description
   Profile Name	Enter a custom name.
   Profile Type	Select MQTT Broker as the connection mode.
   Broker Address	Enter an endpoint specified in the MQTT protocol. For example, m1.tuyacn.com shown in the screenshot.
   Broker Port	Enter a port number. Set this parameter to 8883.
   Client ID	Enter a value in the format tuyalink_{$deviceid}. deviceid is specified in the MQTT protocol.
   General	Use the default value.

4. Complete the required information on the User Credentials page.

   

   Parameter	Description
   User Name	${deviceId}|signMethod=hmacSha256,timestamp=${10-digit current timestamp},secureMode=1,accessType=1 For example, 6c828cba434ff40c074wF2|signMethod=hmacSha256,timestamp=1607837283,secureMode=1,accessType=1
   Password	hmacSha256(content, deviceSecret) The plaintext of content is a string concatenated with deviceId, timestamp, secureMode, and accessType in sequence. For example, content is made of deviceId=6c828cba434ff40c074wF2, timestamp=1607635284, secureMode=1, accessType=1 The password is a 64-character hexadecimal value. Pad the left-most bits with zero if necessary.

   • The DeviceID and DeviceSercet are generated after you register a device. For more information, see Prerequisites.

   • Password: Open the online Python environment. Copy the code below, replace DeviceID and DeviceSecret with your own values, and then run it to obtain the result.

     # Get device information from the Tuya IoT Development Platform.
     DeviceID = '6cae4****b285b5t0d2'
     DeviceSecret = 'f9df8***bbaddc941'
     
     # Default settings
     Address='m1.tuyacn.com'
     Port = 8883
     
     # Calculate Client ID
     ClientID = 'tuyalink_'+DeviceID
     
     # Calculate user name
     import time
     T = int(time.time())
     UserName= f'''{DeviceID}|signMethod=hmacSha256,timestamp={T},secureMode=1,accessType=1'''
     
     # Calculate password
     import hmac
     from hashlib import sha256
     
     data = f'''deviceId={DeviceID},timestamp={T},secureMode=1,accessType=1'''.encode('utf-8')  # Encrypted data
     appsecret = DeviceSecret.encode('utf-8')  # Secret key
     
     Password = hmac.new(appsecret, data, digestmod=sha256).hexdigest()
     
     # Print the parameters required for connecting to MQTT.
     print('-'*20)
     print('Client ID: ',ClientID)
     print('Server address: ',Address)
     print('Port: ',Port)
     print('*Username: ',UserName)
     print('*Password: ',Password)
     
     print('SSL/TLS: true\nCertificate type: CA signed server\nSSL secure: Enable')
     print('-'*20)
     

5. Click SSL/TLS, select Enable SSL/TLS, and set Protocol to TLSv1.2.

   

6. Click OK in the lower-right corner. Click Connect.
   If the indicator on the right side turns green, the MQTT connection is established.

   

Test communication

Device-to-cloud communication

1. In the Publish field, enter the topic and the payload and then click Publish. We use the topic tylink/6c855a6e81c40a91e9k5gx/thing/property/report as an example to describe the process.

   

2. Check Device Logs on the Tuya IoT Development Platform. Enter the DeviceID. If the published message is displayed, the upstream communication is successful.

Cloud-to-device communication

1. In the Subscribe field, enter the topic and then click Subscribe. A subscription message will be displayed on the client. We use the topic tylink/6c855a6e81c40a91e9k5gx/thing/model/get_response as an example to describe the process.

   

2. In the Publish field, enter the subscribed topic and then click Publish.

   

3. Click the Subscribe tab. If the subscribed topic receives a message from the cloud, the downstream communication is successful.