如何防止其他电话/手机号码向 Arduino 发送 SMS 命令? [英]How to prevent other phone/mobile numbers to send SMS command to Arduino?
有没有办法使用 arduino 和 gsm 模块一次拨打多个电话号码? [英]Is there any way to ring multiple phone number at once using arduino and gsm module?
如何在命令中输入PIN码? 我试图跟随没有成功 [英]how to enter PIN number at command ??? I have tried to following to no success