Hello,
If you just want to receive 433mhz signals, and from a letterbox I supose that’s the case, your best option it is rtl_433 : GitHub - merbanan/rtl_433: Program to decode radio transmissions from devices on the ISM bands (and other frequencies)
There is also addon for HA: Home Assistant Add-on: rtl_433 with MQTT auto discovery
You just need a DVB-T usb dongle
I use an ESPHome and Portisch-flashed Sonoff RF Bridge transceiver and a LilyGo LoRa32 receiver running the OMG LilyGo rtl_433 firmware. The Sonoff has worked well for door/window sensors and a couple ceiling fan remotes for a few years. I added the LilyGo receiver a couple months ago when I found out the middle school down the street has an RF weather station that I could pull into HA.
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Interesting, I have a KC868-A8.
What modules are you using? Also what range can be expected?
So off r2 no portisch but works
What do you mean by module ? for range you can expect 10/20m easily if radio is not too noisy in your area 
I’ve been very happy with my DIY transciever
I recall people mentioning rf door sensors for letterboxes.
I don’t know how reliable it is.
Im using a YoLink door sensor for mine. The mailbox is a couple hundred feet away. No issues at all.
You can get the sensor and hub needed on Amazon pretty cheap. They integrate well into HA.
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What range do you expect from this? Also this can be used to send any command right, not related to Sonoff at all?
Looks decent.
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Also, does transceiver mean it can both transmit and receive in both directions?
Take a look at this:
It is for the older Sonoff RF Bridge.
The newer one do not support Portisch, I think, but it can still do a lot of the stuff.
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They claim 100m or greater. I haven’t tested for range though. I just use it in my apartment. Looks like you can also increase voltage to increase range.
Yes it has both a seperate transmitter and receiver, which you’ll sometimes see shortened as transciever.
You can send any codes (I believe). You can learn the codes from most cheap rf devices like motion sensors and door sensors.
Could you share your yaml config? Are you able to get external temperature sensors?
Are you able to locally control this newer Sonoff RF Bridge (without support for Portisch)?
No, because I don’t have a Sonoff Bridge;)
I made a DIY device.
My brain is broke or something. Im getting multiple On/Off for one button press. I tried several filters to make it only report 1 on/off sequence but no go. Any ideas?
I tried both Raw and RC codes.
- platform: remote_receiver
name: "keychainRF_D"
rc_switch_raw:
code: '110001011110100000100001'
protocol: 1
- platform: remote_receiver
name: "keychainRF_Pronto"
pronto:
data:
'0000 006D 0019 0000 0026 0010 0024 0010 000C 0026 000D 0026 000D 0026 0026 0010 000C 0026 0026 0010 0025 0010 0025 0010 0025 0010 000C 0026 0026 0010 000C 0026 000D 0026 000D 0026 000D 0026 000D 0026 0026 0010 000C 0026 000D 0026'
Did you try delayed_off: ?
Might need to see your config.
i tried delayed_on_off:
they would just toggle to Off and wouldn’t go back On again.
The transmitter is sending them in sets of 4, and I cant change the transmitter. I had this happen way back when with an IR remote and I don’t remember how I got it working right.
see…I told you my brain was broke today.
I tried delayed_on_off: it was a no go.
I just tried delayed_off: and it works how i want it now.
thanks
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Ahh, cool. Have any links with more info about it? 
EDIT: nevermind, I see it earlier in this thread now!
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