# Alarm over 4G/GSM?

**URL:** <https://community.homey.app/t/alarm-over-4g-gsm/48009>\
**Category:** Questions & Help\
**Created:** [June 1, 2021, 6:50am UTC](https://community.homey.app/t/alarm-over-4g-gsm/48009 "2021-06-01T06:50:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jonas\_Lindbom](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jonas_lindbom/32/33861_2.png) [@Jonas\_Lindbom](https://community.homey.app/u/Jonas_Lindbom)\
**Post date:** [June 1, 2021, 6:50am UTC](https://community.homey.app/t/alarm-over-4g-gsm/48009/1 "2021-06-01T06:50:27Z")

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Hi I am thinking buying Homey and connect Netatmo indoor/outdoor cameras and door and window sensors or security system Smonos. But does any one know of a GSM/4G that can send a detection to App if power and Internet is down? Is there a gadget for that kind of problem to solve, perhaps a powersupply and GSM/4G gadget together? Most Alarm operators has that installed in their systems.

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [June 1, 2021, 2:05pm UTC](https://community.homey.app/t/alarm-over-4g-gsm/48009/2 "2021-06-01T14:05:45Z")

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The only things I know are

- A UPS with GSM/SMS functionality
- A router with GSM/SMS backup functionality
- An (old) smartphone with permanent power, and ofcourse an active gsm+data sim.  
With Macroidroid, create a macro with a “Power disconnected” trigger, and a “send message / sms / email” action.

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**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\
**Post date:** [June 1, 2021, 2:10pm UTC](https://community.homey.app/t/alarm-over-4g-gsm/48009/3 "2021-06-01T14:10:59Z")

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[https://randomnerdtutorials.com/?s=GSM](https://randomnerdtutorials.com/?s=GSM)

> **[Connect ESP32 SIM800L to Cloud MQTT Broker | Random Nerd Tutorials](https://randomnerdtutorials.com/esp32-cloud-mqtt-broker-sim800l/)**
>
> How to connect the TTGO T-Call ESP32 SIM800L board to the Internet using a SIM card data plan and publish data to the cloud MQTT broker without using Wi-Fi with Arduino IDE.