Nbiot module me3616 at command mqtt connecting thingsboard

One 、 technological process

1. Device reset

   AT+ZRST
   
   OK
   

2. Inquire about CSQ

   AT+CSQ
   
   +CSQ: 5,0
   
   OK
   

3. Query registration

   AT+CEREG?
   
   +CEREG: 0,1
   
   OK
   

4. After the device is reset , Insert SIM Card and whether to get it IP, Yes, they have taken the initiative to report , So just reset the device , And wait for judgment +IP that will do

5. link MQTT The server

   AT+EMQNEW="xxx.xxx.xxx.xxx","1883",12000,1024// link MQTT ,AT  The command waiting time is 12 second   A buffer for 1024 byte 
   
   +EMQNEW: 0
   
   OK 
   

6. Initiate link request

   AT+EMQCON=0,4,"ac3fec30-740d-11ec-bd2e-27176d3ae09b",60000,1,0,"rCeBhUPApA3dbO8CaDJ8","123" // You have to use MQTT4 agreement  ID It's the equipment ID, Put the authentication code into the user name , Take your password with you 
   
   OK
   

7. Release data Note that the data is Ascii HEX, Length only Ascii The length of
   Here pay attention to QoS 1 better ,QoS 0 I don't know whether it was sent successfully , Sometimes the network has problems , This module still returns OK Of

   AT+EMQPUB=0,"v1/devices/me/telemetry",1,0,0,16,"7B224843484F223A302E30303130357D"// Note that 16 Hexadecimal data   Here we use  QoS 1