[root@localhost toybrick]# minicom -D /dev/ttyUSB2

Welcome to minicom 2.7.1                                                                                                                              
                                                                                                                                                       
OPTIONS: I18n                                                                                                                                         
Compiled on Aug 13 2018, 16:38:42.                                                                                                                    
Port /dev/ttyUSB2, 10:03:48                                                                                                                           
                                                                                                                                                       
Press CTRL-A Z for help on special keys                                                                                                               
                                                                                                                                                       
//打开回显                                                                                                                                               
ate                                                                                                                                                   
OK                                                                                                                                                    

查询版本信息
AT+LCTSW
SoftwareVersion: QB30001.1.7_MX10
InnerVersion: QB30001_0016_1.3.6_L1019_EFS3.3
AP: QB30001_0016_1.3.6_L1019_MX10

OK

查询信号,将会得到信号强度和误码率信息
AT+CSQ
+CSQ: 99,125

OK

信号良好

at+csq
+csq: 31,49

OK

https://m2msupport.net/m2msupport/atcsq-signal-quality/

支持的访问， 0-31都是好的
at+csq=?
+CSQ: (0-31,99),(51-113,125)

OK

+CIEV: 1,5

+CIEV: 4,1

+CIEV: 2,1

+CIEV: 4,0

+CREG: 1,"59D6","1F9D", 0

+CGREG: 2

+CIEV: 6,1

+CGREG: 1,"59D6","1F9D",0
AT+CSQ
+CSQ: 30,53

OK

+CREG: 1,"59D6","3D61", 0

+CGREG: 1,"59D6","3D61",0

注册状态
AT+CREG?
+CREG: 2,1,"59D6","3D61",0

OK

网络运营商信息                                                                                                                                                 
AT+COPS?                                                                                                                                              
+COPS: 0,0,"CHINA MOBILE",0                                                                                                                           
                                                                                                                                                       
OK                                                                                                                                                    
                                                                                                                                                   

+CREG: 1,"59D6","1F9D", 0

+CGREG: 1,"59D6","1F9D",0

拨号
AT$QCRMCALL=1,1
OK

AT+CSQ
+CSQ: 30,53

断开拨号
AT$QCRMCALL=0,1
OK

参考：

http://jasonfly.me/lora%E5%9F%BA%E7%AB%99%E5%BC%80%E5%8F%91/

At Commands的学习计划

https://blog.csdn.net/laozhuxinlu/article/details/52085150

AT命令集详解

https://blog.csdn.net/zqixiao_09/article/details/52506349