RTK never progresses past SINGLE (fix=1)

IoT Modules GNSS Module
1

Module: LC29H(DA), mounted on Waveshare LC29H(DA) GPS/RTK HAT (SKU 25279)
Firmware: LC29HDANR11A03S_RSA

Issue: RTK never progresses past SINGLE (fix=1), even with a clean, complete RTCM3 correction stream and excellent sky view.

Boot log shows a repeating acknowledgment failure from first power-on, every time, regardless of reset:

$PAIR011,00127
$PAIR010,1,-116
$PAIR010,2,-115
$PAIR001,011,239
$PAIR001,010,238
$PAIR001,010,238
$PAIR001,001,238
$PAIR001,001,238
(repeats indefinitely, Result=2 “command sending failed”)

This loop is present before I send any commands myself — it’s part of the module’s own startup sequence. No ML1220 backup battery is installed, so I understand PAIR010 (PAIR_REQUEST_AIDING) returning -1 is expected on cold start. The repeating PAIR001,001,2 afterward is what concerns me.

Despite this, I’ve confirmed the following all work correctly:

  • UART/power/wiring: clean NMEA output, correct baud (115200)
  • Sky view: 27-28 satellites tracked, HDOP consistently under 1.0
  • NTRIP: connected to FLEPOS (Belgian VRS network) via FLEPOSVRS32GREC, sending live GGA every 5s
  • RTCM3 stream: CRC24Q-validated, 0 bad frames, correct message set present — 1005 (station coordinates), 1075/1085/1095 (GPS/GLONASS/Galileo MSM4), plus 1030-1033/1230/1304/4094 auxiliary messages, all arriving continuously

With a textbook-complete correction stream landing on the RX pin and a strong sky view, I’d expect to see RTK Float (5) within seconds and Fixed (4) shortly after. Instead the GGA fix field stays at 1 indefinitely, unchanged, no matter how long the corrections stream.

Questions:

  1. Is the repeating PAIR001,001,2 boot loop a known issue, and could it be preventing the RTK engine from actually applying incoming corrections even though raw positioning works fine?
  2. Is there a firmware version newer than LC29HDANR11A03S_RSA that addresses this? I haven’t been able to find a public download and would appreciate it being shared.

Happy to provide additional logs, a QGNSS capture, or test intermediate firmware if useful. Thanks in advance.

2

Here the issue, old fw accept only MSM4 or 7 e.g 1074…1077…

please ask explicity for the new fw.

3

How do i obtain the newest firmware? Can someone at quectel please send it to me?

4

E.G.
hello @Dobrica
hello @mohamad.firdaus
can I…
put it here LC29HDA Firmware request
or begin a new topic.

5

That topic is closed, so i ask here @mohamad.firdaus @Dobrica

Can i get the latest firmware please?

6

Hi @test_test,

Please check your email. I have sent you the latest firmware.

Best Regards

7

Thank you. The installation was successful. However even with different NTRIP clients i never get an RTK fix (even in QGNSS). What can i do to resolve this?

8

Hi @test_test Do you mind sharing your setup environment photo? Also please help on below questions:

  1. Type of Antenna used and is it dual-band?
  2. What is the average C/No signal strength? can share the NMEA log?
  3. NTRIP connection over WIFI or mobile internet?
  4. How long the module been tested? Allow the module to run under open sky with clear view for more that 10 minutes.

Best regards,