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+How to set MQTT parameters
+
+1. Settable Parameters
+
+
+Sleep  --- *DEBUG -->  Debug   --- *ADMIN -->  Admin
+mode   <-- *SLEEP ---  mode    <-- *DEBUG ---  mode
+
+
+# in Sleep mode
+
+Switch to debug mode   command: *DEBUG         response: Debug mode ok
+
+The fault mode of the device is sleep mode, which is the normal working mode. Other modes are parameter setting related.
+
+# in Debug mode
+
+                       command                         response
+                       -------                         --------
+Set MQTT protocol      #NB_MQTT
+                               Please set IP or domain name at the same time
+
+Set IP                 #IP=125.227.248.178,1883        OK IP=125.227.248.178,1883i
+                               Static IP is strongly recommended
+
+Set domain name                #MQTT_IP=mqtt.zc-sensor.com,1883        OK MQTT_IP:mqtt.zc-sensor.com,1883
+                               You should write in either IP or domain name; not both.
+
+Set DNS                        #DNS=218.4.4.4                  Set DNS as: 218.4.4.4
+                               Optional, only useful when domain name connection is not smooth.
+
+Set client ID          #ClientID=123456789             OK DeviceID=123456789 Username= password=
+                               It is not recommended to set these three parameters unless it is necessary.
+                               By default, the ClientID is the IMEI, and the user name and password are empty.
+Set user name          #Username=test                  OK DeviceID=123456789 Username=test password=
+Set password           #Password=123456                OK DeviceID=123456789 Username=test password=123456
+
+Set heartbeat interval #HR300                          Heartbeat interval: 300                 300/60=5mins
+
+Set NB network access timeout  #POWERTIME=300          NB network access trial time after power-on: 300 seconds
+                                                       Default value is 600 seconds.
+
+Set sleep mode         *SLEEP                          Sleep mode ok                   Exit debug mode
+
+Set admin mode         *ADMIN                          Admin mode ok                   Enter admin mode to set APN
+
+
+
+# in Admin mode
+
+Set APN                        AT*MCGDEFCONT="IPV4V6",""nbiot" *MCGDEFCONT: "IPV4V6",""nbiot"
+
+Read APN settings      AT*MCGDEFCONT?                  *MCGDEFCONT: "IPV4V6",""nbiot"
+
+Read SIM card number   AT*MICCID                       *MIICCID: 898601177231000559705
+
+Read device IMEI       AT+CGSN=1                       +CGSN: 869858033594491
+
+Check if device is connectted to NB network
+                       AT+CEREG?                       +CEREG: 0,1     1 = network access successful, 2 = searching for network
+
+Read current NB network band
+                       AT*MBAND?                       *MBAND: 8
+
+Set debug mode         *DEBUG                          Debug mode ok           Exit admin mode
+