rtl_433 add-on stalls at "[R82XX] PLL not locked!" on Pi 5 / HAOS 18.3, no data

Configuration
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1

Hi all, I’m hoping someone has hit this and found a fix.

Setup

  • Raspberry Pi 5, HAOS 18.3, Supervisor 2026.09.3, Core 2026.9.4
  • Nooelec NESDR SMArt v5 (RTL2832U + R820T, 0bda:2838) plugged directly into the Pi, antenna attached
  • Two Nabu Casa ZBT-2s (Zigbee and Thread) on the other USB bus
  • Mosquitto add-on; rtl_433 publishing to MQTT

Symptom
Both the rtl_433 (0.7.0 / rtl_433 25.12) and rtl_433 (next) add-ons start, find the tuner, set the sample rate, and then stop here:

Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!

After that there’s nothing: no “Tuned to 433.920MHz”, CPU at ~0.03%, and no MQTT events. The add-on still shows as running. verbose and output log are on.

Config

device 0
sample_rate 250k
frequency 433.92M
pulse_detect squelch
gain 25
protocol 40
protocol 210
verbose
convert si
output log

Already tried

  • Reseating the dongle and checking the antenna
  • Fixing the frequency (it was wrongly set to 433.0M)
  • Switching from the next add-on to stable; both behave the same

Related: there’s an open GitHub issue with the same symptom on a HA Yellow (HAOS 18.2) with the same dongle. The dongle worked on Windows but not on HAOS, and then started working again on its own: rtl_433-next receives no data after “[R82XX] PLL not locked!” with Nooelec NESDR SMArt v5 · Issue #254 · pbkhrv/rtl_433-hass-addons · GitHub

Questions

  • Has anyone seen the R820T stall like this on HAOS 18.x, especially on a Pi 5?
  • Could it be a USB power or bus issue with the ZBT-2s on the same Pi? Would a powered hub be worth trying?
  • Are there kernel or driver changes in recent HAOS releases (DVB driver blacklist, librtlsdr) that could cause it?

Next I’m running rtl_test on another machine to rule out the dongle. Thanks!

2

Not 100% sure about you, but it is exactly what I get for me until rtl433 actually detects something (here analysing)

rtl433  | rtl_433 version 25.12-54-gb8e28683 branch rebase at 202604090823 inputs file rtl_tcp RTL-SDR with TLS
rtl433  | MQTT: Publishing MQTT data to mqtt.lan port 1883
rtl433  | MQTT: Publishing availability to MQTT topic "rtl_433/20aefa0f33c9/availability".
rtl433  | MQTT: Publishing device info to MQTT topic "rtl_433/ha-addon/devices[/type][/model][/subtype][/channel][/id]".
rtl433  | MQTT: Publishing events info to MQTT topic "rtl_433/ha-addon/events".
rtl433  | MQTT: Publishing states info to MQTT topic "rtl_433/ha-addon/states".
rtl433  | Found Rafael Micro R820T tuner
rtl433  | Exact sample rate is: 250000.000414 Hz
rtl433  | [R82XX] PLL not locked!
rtl433  | Detected FSK package  2026-10-04T15:50:32.292609+0200
rtl433  | Analyzing pulses...
rtl433  | Total count:   43,  width: 18.20 ms           ( 4549 S)
rtl433  | Pulse width distribution:
rtl433  |  [ 0] count:    8,  width:  192 us [172;232]  (  48 S)
rtl433  |  [ 1] count:   10,  width:   44 us [40;52]    (  11 S)