NEXA LMST-606 range problem

As a part of my home automation system, I have a NEXA LMST-606 magnetic switch on the front door. The NEXA LMST-606 is capable of sending "on" and "off" signals when the door is opened and/or closed. The problem is that it has a terrible range when used with the RFXCOM RFXtrx433E USB 433.92MHz Transceiver. With only two open, or closed, doors between the LMST-606 and the RFXCOM, the signal is blocked.

PIR sensor for Tellstick Duo

I have tried a few cheap ready made 433MHz PIR sensors bought from eBay and aliexpress, but non of them worked with my Tellstick Duo/Nexa system. I decided to make my own, and here's the result. I'm testing the prototype now, using my own API to get push notifications on my Android phone when movement is detected in my office at home. Works like a charm.

Radio interference

Last night my wireless temperature sensors suddenly stopped working. Since all of them stopped at the same time, I thought it was the receiver connected to my server. Then I discovered that the Nexa remote switches didn't work either... They run on the same frequency as my temperature sensors. They worked if I held the remote very close to the receivers. That can only mean there is severe RF noise on 433MHz.

Tellstick and Switch King

Creating a smart home takes more than just reading off some temperature sensors. My home should be able to switch/dim lights, heating, fans etc. based on environmental conditions. I should also be able to remotely control everything from a smart phone and a web page and react upon scenarios. As I have mentioned before, I don't want to buy a ready to use commercial system. I want to be able to add my own made devices to the system. I had a few criteria for selecting a system, listed below.

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