Quectel NBIOT AT

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AT+CGMR Check Software Version Revision: BC26NAR01A01 Example
AT+CESQ Check signal quality +CESQ: 43,99,255,255,30,69 Example
AT+CPSMS? Check PSM Mode Example Example
AT+CFUN=0 Enter into sleep mode, +CGATT:0
AT+QBAND? 查看当前所在的频段。 +QBAND:5
AT+CGATT? 0为入网失败,返回1为入网成功。 +CGATT:1