SIM7020 AT

AT+CPIN? // check if sim card avaialble
AT+CSQ // +CSQ: 5,0 // correct in 0-98, incorrect 99
AT+CREG? //+CREG: 0,6 // 6 indicate the stats registered, please refer to datasheet
AT+COPS? // +COPS: 0,2,"46000",9 // last word 9 indicate nbiot network registered

<netact> 
0 User-specified GSM access technology
8 User-specified LTE M1 A GB access technology
9 User-specified LTE NB S1 access technology

Basic	Test: e.g. AT+IPR=?	Read, e.g. AT+IPR?	Write, e.g. AT+IPR=9600
Baudrate - AT+IPR	-	+IPR: 9600 OK	-
AT+CBAND	+CBAND: (1,3,5,8,20,28) OK	-	-
AT+CENG	+CENG: (0-1) OK	+CENG: 3738,2,402,"0D1C1E41",-75,-5,-70,14,8,"1D26",0, +CENG: 3738,2,146,-89 +CENG: 3738,2,1,-88 OK	-
AT+GSV			* SIMCOM_Ltd * SIM7020E * Revision:1752B03SIM7020E * OK

Commands	Feedback
AT+CIPPING="192.168.1.1", 4, 32, 100	* OK * +CIPPING: 1,192.168.1.1,7,250 * +CIPPING: 2,192.168.1.1,8,250 * +CIPPING: 3,192.168.1.1,3,250 * +CIPPING: 4,192.168.1.1,3,250
AT+CDNSGIP=www.baidu.com	+CDNSGIP: 111.13.100.92 OK
AT+CIPPING="111.13.100.92",4,32,100	OK +CIPPING: 1,111.13.100.92,4,54 +CIPPING: 2,111.13.100.92,3,54 +CIPPING: 3,111.13.100.92,3,54 +CIPPING: 4,111.13.100.92,3,54

+CGACT: 1,1

Commands List	Return	Note
AT+CMQNEW?	+CMQNEW: 0,0,null +CMQNEW: 1,0,null +CMQNEW: 2,0,null +CMQNEW: 3,0,null +CMQNEW: 4,0,null OK	Check connections
AT+CMQNEW="167.88.114.101","1883",6000,32,1	+CMQNEW: 0 OK	make connection, our server iot.electrodragon.com
AT+CMQCON=0,3,"client_id",10,0,0	OK	connect to "client_id"?
AT+CMQSUB=0,"client_id",0	OK	subscribe to "client_id"
AT+CMQPUB=0,"client_id",0,0,0,5,"HE"	ERROR	publish to "client_id" but 5 is error length for "HE" data buff
AT+CMQPUB=0,"client_id",0,0,0,2,"HE"	OK +CMQPUB: 0, "client_id?��鵋�� € �滃��", 0, 0, 0, 0, ""	seems sent properly
AT+CMQNEW?	+CMQNEW: 0,1,167.88.114.101 +CMQNEW: 1,0,null +CMQNEW: 2,0,null +CMQNEW: 3,0,null +CMQNEW: 4,0,null OK	check connections

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