Sonoff 433 bridge

[alowhum]

For security reasons I want to have the fewest ARM based Wifi connected devices in my home possible.

[alexsh1]

@alowhum I do not understand your issues with security. It does not have to be Wifi by the way.

I may be mistaken, but I do not think you'd find a lot of support for 433Mhz around.

[alowhum]

Cheap Wifi-based IOT chips are extremely dubious. The NSA and others even use the ARM chips inside harddrives to create unremovable trojans, so hacking these IOT devices is nothing compared to that.

https://www.reddit.com/r/esp8266/comments/58q9wi/are_we_building_weapons_of_mass_destruction_our/

https://github.com/esp8266/Arduino/issues/3725

https://olimex.wordpress.com/2015/07/17/esp8266-has-now-lot-of-followers-but-they-do-not-offer-anything-better/

[zboblamont]

@alexsh1 I use 433MHz exclusively for local networks as it has proven completely reliable and resilient, and I am far from being alone..
Your " I do not think you'd find a lot of support for 433Mhz around" may prove a flawed perspective. Frequencies and traffic are increasingly cramped, no more so in the burgeoning 2.4 and 5GHz environment, 433 etc are of increasing interest I suggest, not less..

[alexsh1]

@alowhum intereeting - I do not know about it, but my preference would be Wifi for a different reason. I’d like to make home automation independent and not dependent on WiFi

[alexsh1]

@zboblamont feel free to disagree. Firstly, I use 868Mhz and 2.4Ghz. 2.4Ghz has got many channel so if properly setup, congestion is completey irrelevant. And secondly, the major reason I ditched all my 433Mhz nodes was due to the fact that it does not have ack. I even considered buying RFXCOMM. I have used 433Mhz setup with remote water heating and once it did not work. It was enough for me to switch to a different technology.
I still have one LightwaveRF switch (433Mhz) which I’m controlling remotely, but i’ll get rid of that eventually too.

[alowhum]

I think the confusion is that this thread is about using a protocol that DOES have ACK (MySensors) on the 433 frequency. So while a lot of cheap devices without ACK happen to use the 433 frequency, any problem lies not with the frequency, but with the protocol used.

[alexsh1]

@alowhum I did not mean MySensors as MySensors do have ack.
I meant any other 433Mhz technology without ACK.

Re your bridge, by chance I found the following link on the Domoticz Forum:

http://tinkerman.cat/hacking-sonoff-rf-bridge-433/#lightbox-gallery-c9PV/10/

[alowhum]

Yes I've seen that link.

I started this thread to ask the question "could this hardware be used as a nice, cheap and powerful gateway for MySensors?".

[quby]

@alowhum As I see the topic is rather old, but I didn't find any other in this topic. So my question is the same: Can the sonoff RF bridge be used as a gateway for the mysensors 433 nodes?

[alowhum]

@alexsh1 I've built something you might be interested in:
https://forum.mysensors.org/topic/10094/candle-433-hub-a-universal-433mhz-signal-cloner/1