Simple alarm system

[mattia]

My project is very simple, the goal is to replicate all the functions of a real alarm system in the best way.

The system is currently composed of:
- Raspberry Pi 3 Mod B + / Domoticz
- Sonoff RF Bridge + Tasmota
- Huawei e3531 + Sim Thingmobile
- 2 Door sensor
- 2 motion sensors
- 1 buzzer
- 1 UPS
- 1 Android app (self-construction)

The system works in this way, taking advantage of the domoticz api, I created an android application that remotely allows me to activate / deactivate the alarm (the status of the secpanel is changed).
If the alarm has arrived, the programmed events allow you to send notifications (telegram, sms or email), if one or more sensors are activated.
Now I am drawing the "system body" through Adobe Fusion, as soon as the design is finished I will print it with my 3D printer.

Unfortunately, the system has a defect.
The house where I live has very thick walls, some 433 MHz sensors cannot communicate with the sonoff RF, before evaluating a hardware change, I wondered if it was possible to replace the base antenna, with an external one.

Does anyone have any alternative proposals?

[Hobbybob]

You could try Z-wave, they build up a mesh between the Zwave-devices, so if one is too far away from the main system, it could possibly still be reachted through another z-wave detector.

[Dave21w]

If you only use battery powered z-wave sensors this will not work, just like zigbee only mains powered devices will act as repeaters. By Sonoff RF are you talking about the bridge? if so I would change to either an RFXCom or an RFLink, both have options for external antennas which will make the biggest difference.

Dave

[rolandtwilt]

The problem is that not all (Sonoff) devices are supported by RFLink, the Sonoff Bridge does support all devices of its own brand. I did not manage to connect the sonoff smoke detectors via RFLink and I am therefore stuck to the sonoff Bridge. Do you think an external antenna is possible or multiple Sonoff Bridges?