[Bug]: RAK12500 GPS not detected on RAK19001 — firmware only probes UART, never I2C

[mowaxuk]

Category

Other

Hardware

Rak4631

Is this bug report about any UI component firmware like InkHUD or Meshtatic UI (MUI)?

• Meshtastic UI aka MUI colorTFT
• InkHUD ePaper
• OLED slide UI on any display

Firmware Version

2.7.15.567b8ea

Description

Hardware:

Base board: RAK19001 (Dual IO, 6 sensor slots A-F)
Core: RAK4630 (nRF52840)
GPS module: RAK12500 (u-blox ZOE-M8Q) in Sensor Slot A
SD card: RAK15002 in IO slot (SPI, no I2C conflict)
Firmware: 2.7.15.567b8ea VANILLA

Describe the bug:
The RAK12500 GPS module is not detected by Meshtastic firmware. gps_mode is set to ENABLED but gps_enabled persistently reports false and position returns empty {}.
Serial debug output via PuTTY (115200 baud) shows the firmware probing for GPS over UART only, cycling through all baud rates and chip families before giving up:

DEBUG | [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | [GPS] No GNSS Module (baudrate 9600)
WARN  | [GPS] Give up on GPS probe and set to 9600

The firmware never attempts I2C detection. The u-blox ZOE-M8Q communicates over I2C, so it is never found.

Hardware confirmed working:
Flashing the RAK WisBlock Hardware Test firmware (WB_HW_Test_V1.1.11_H) immediately detects and communicates with the RAK12500, producing valid GNSS output. This confirms the module, wiring, and slot are all correct — the issue is specific to Meshtastic firmware.

Expected behaviour:
Meshtastic should probe for GPS over I2C on the RAK19001 sensor slots, as the RAK12500 uses the u-blox ZOE-M8Q which communicates over I2C. The 3V3_S power rail (controlled by IO2/GPIO34) may also not be being enabled by firmware, preventing the module from powering up before UART probing begins.

**

**

RAK4630 on RAK19001 base board
RAK12500 in Sensor Slot A
Flash Meshtastic 2.7.15 VANILLA
Enable GPS in position config
Observe serial debug — GPS probe attempts UART only and fails

Additional context:
GPS pin settings are all at 0 (rx_gpio, tx_gpio, gps_en_gpio) which is understood to be correct for RAK WisBlock builds per the RAK forum. This issue has also been discussed at https://forum.rakwireless.com/t/issue-with-rak19001-and-rak12500/16109

Relevant log output

[github-actions[bot]]

@mowaxuk, Welcome to Meshtastic! 👋

Thanks for opening your first issue. If it's helpful, an easy way
to get logs is the "Open Serial Monitor" button on the Web Flasher.

If you have ideas for features, note that we often debate big ideas
in the discussions tab
first. This tracker tends to be for ideas that have community
consensus and a clear implementation.

We're very active on discord,
especially the #firmware and #alphanauts-testing channels. If you'll
be around for a while, we'd love to see you there!

Welcome to the community! ❤️

[github-actions[bot]]

Please provide device logs to further diagnose the issue. If using Web Flasher, connect the device via USB, open the device console in the log output area, reproduce the problem, and share the logs. If using Meshtastic CLI, run: meshtastic --port --noproto, reproduce the problem, and provide the terminal output. Also, ensure context includes the steps to reproduce the issue and any expected vs actual behavior details.

[mowaxuk]

PS C:\Users\wayne> meshtastic --port COM3 --noproto
WARNING file:mesh_interface.py _sendToRadio line:1206 Not sending packet because protocol use is disabled by noProto
Connected to radio
WARNING file:mesh_interface.py _sendToRadio line:1206 Not sending packet because protocol use is disabled by noProto
INFO  | ??:??:?? 3

//\ E S H T /\ S T / C

DEBUG | ??:??:?? 3 Filesystem files:
DEBUG | ??:??:?? 3    RAK (108 Bytes)
DEBUG | ??:??:?? 3  prefs (directory)
DEBUG | ??:??:?? 3    channels.proto (57 Bytes)
DEBUG | ??:??:?? 3    module.proto (117 Bytes)
DEBUG | ??:??:?? 3    device.proto (130 Bytes)
DEBUG | ??:??:?? 3    config.proto (209 Bytes)
DEBUG | ??:??:?? 3    nodes.proto (376 Bytes)
DEBUG | ??:??:?? 3  adafruit (directory)
DEBUG | ??:??:?? 3  bond_prph (directory)
DEBUG | ??:??:?? 3  bond_cntr (directory)
DEBUG | ??:??:?? 3 Power::lipoInit lipo sensor is not ready yet
DEBUG | ??:??:?? 3 Use analog input 5 for battery level
INFO  | ??:??:?? 3 Scan for i2c devices
DEBUG | ??:??:?? 3 Scan for I2C devices on port 1
DEBUG | ??:??:?? 3 Register MFG_UID FE: 0xffff
DEBUG | ??:??:?? 3 Register MFG_UID 05: 0xffff
INFO  | ??:??:?? 3 No I2C devices found
DEBUG | ??:??:?? 3 acc_info = 0
INFO  | ??:??:?? 3 S:B:9,2.7.15.567b8ea,rak4631,meshtastic/firmware
INFO  | ??:??:?? 3 Build timestamp: 1763424000
DEBUG | ??:??:?? 3 Reset reason: 0x0
DEBUG | ??:??:?? 3 Set random seed 4272588720
INFO  | ??:??:?? 3 Init NodeDB
INFO  | ??:??:?? 3 Load /prefs/nodes.proto
INFO  | ??:??:?? 3 Loaded /prefs/nodes.proto successfully
INFO  | ??:??:?? 3 Loaded saved nodedatabase version 24, with nodes count: 2
INFO  | ??:??:?? 3 Load /prefs/device.proto
INFO  | ??:??:?? 3 Loaded /prefs/device.proto successfully
INFO  | ??:??:?? 3 Loaded saved devicestate version 24
INFO  | ??:??:?? 3 Load /prefs/config.proto
INFO  | ??:??:?? 3 Loaded /prefs/config.proto successfully
INFO  | ??:??:?? 3 Loaded saved config version 24
INFO  | ??:??:?? 3 Load /prefs/module.proto
INFO  | ??:??:?? 3 Loaded /prefs/module.proto successfully
INFO  | ??:??:?? 3 Loaded saved moduleConfig version 24
INFO  | ??:??:?? 3 Load /prefs/channels.proto
INFO  | ??:??:?? 3 Loaded /prefs/channels.proto successfully
INFO  | ??:??:?? 3 Loaded saved channelFile version 24
ERROR | ??:??:?? 3 Could not open / read /prefs/uiconfig.proto
DEBUG | ??:??:?? 3 cleanupMeshDB purged 0 entries
DEBUG | ??:??:?? 3 Use nodenum 0x819e55b6
DEBUG | ??:??:?? 3 Expand short PSK #1
INFO  | ??:??:?? 3 Wanted region 3, using EU_868
DEBUG | ??:??:?? 3 Coerce telemetry to min of 30 minutes on defaults
INFO  | ??:??:?? 3 Sort took 0 milliseconds
DEBUG | ??:??:?? 3 Save to disk 0
WARN  | ??:??:?? 3 Packet History - Invalid size -1, using default 160
DEBUG | ??:??:?? 3 Use compiled/slipstreamed tzplaceholder
DEBUG | ??:??:?? 3 Saved TZ: GMT0BST,M3.5.0/1,M10.5.0
DEBUG | ??:??:?? 3 Set Timezone to GMT0BST,M3.5.0/1,M10.5.0
INFO  | ??:??:?? 3 GPS power state move from OFF to ACTIVE
DEBUG | ??:??:?? 3 Rescan for I2C keyboard
DEBUG | ??:??:?? 3 Scan for I2C devices on port 1
DEBUG | ??:??:?? 3 Scan address 0x1f
DEBUG | ??:??:?? 3 Scan address 0x34
DEBUG | ??:??:?? 3 Scan address 0x55
DEBUG | ??:??:?? 3 Scan address 0x5a
DEBUG | ??:??:?? 3 Scan address 0x5f
ERROR | ??:??:?? 3 Could not open / read /prefs/cannedConf.proto
INFO  | ??:??:?? 3 CannedMessageModule is enabled
ERROR | ??:??:?? 3 Could not open / read /prefs/ringtone.proto
INFO  | ??:??:?? 3 Init External Notification Module
INFO  | ??:??:?? 3 Use Pin 36 in digital mode
DEBUG | ??:??:?? 3 SX126xInterface(cs=42, irq=47, rst=38, busy=46)
DEBUG | ??:??:?? 3 SX126X_DIO3_TCXO_VOLTAGE defined, using DIO3 as TCXO reference voltage at 1.800000 V
INFO  | ??:??:?? 3 Start meshradio init
INFO  | ??:??:?? 3 Radio freq=869.525, config.lora.frequency_offset=0.000
INFO  | ??:??:?? 3 Set radio: region=EU_868, name=LongFast, config=0, ch=0, power=27
INFO  | ??:??:?? 3 myRegion->freqStart -> myRegion->freqEnd: 869.400024 -> 869.650024 (0.250000 MHz)
INFO  | ??:??:?? 3 numChannels: 1 x 250.000kHz
INFO  | ??:??:?? 3 channel_num: 1
INFO  | ??:??:?? 3 frequency: 869.525024
INFO  | ??:??:?? 3 Slot time: 28 msec, preamble time: 131 msec
INFO  | ??:??:?? 3 Final Tx power: 22 dBm
INFO  | ??:??:?? 3 SX126x init result 0
INFO  | ??:??:?? 3 Frequency set to 869.525024
INFO  | ??:??:?? 3 Bandwidth set to 250.000000
INFO  | ??:??:?? 3 Power output set to 22
DEBUG | ??:??:?? 3 Current limit set to 140.000000
DEBUG | ??:??:?? 3 Current limit set result 0
DEBUG | ??:??:?? 3 Set DIO2 as RF switch, result: 0
DEBUG | ??:??:?? 3 SX126X_RXEN not defined, defaulting to RADIOLIB_NC
DEBUG | ??:??:?? 3 SX126X_TXEN not defined, defaulting to RADIOLIB_NC
DEBUG | ??:??:?? 3 Use MCU pin -1 as RXEN and pin -1 as TXEN to control RF switching
INFO  | ??:??:?? 3 Set RX gain to boosted mode; result: 0
INFO  | ??:??:?? 3 SX1262 init success
INFO  | ??:??:?? 3 Not using Ethernet
DEBUG | ??:??:?? 3 LoRA bitrate = 116.967873 bytes / sec
INFO  | ??:??:?? 3 PowerFSM init, USB power=1
DEBUG | ??:??:?? 3 State: BOOT
DEBUG | ??:??:?? 3 Node status update: 2 online, 2 total
INFO  | ??:??:?? 3 [ExternalNotification] Turning off external notification:
INFO  | ??:??:?? 3 [ExternalNotification] Stop RTTTL playback
INFO  | ??:??:?? 3 [ExternalNotification] Turning off setExternalStates:
INFO  | ??:??:?? 3 [ExternalNotification] 0
INFO  | ??:??:?? 3 [ExternalNotification] 1
INFO  | ??:??:?? 3 [ExternalNotification] 2
DEBUG | ??:??:?? 3 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | ??:??:?? 4 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | ??:??:?? 5 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | ??:??:?? 6 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | ??:??:?? 6 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | ??:??:?? 7 [PowerFSM] Init NRF52 Bluetooth
INFO  | ??:??:?? 7 [PowerFSM] Init the Bluefruit nRF52 module
INFO  | ??:??:?? 7 [PowerFSM] Bluetooth pin set to '484148'
INFO  | ??:??:?? 7 [PowerFSM] Init the Device Information Service
INFO  | ??:??:?? 7 [PowerFSM] Init the Battery Service
INFO  | ??:??:?? 7 [PowerFSM] Init the Mesh bluetooth service
INFO  | ??:??:?? 7 [PowerFSM] Set up the advertising payload(s)
INFO  | ??:??:?? 7 [PowerFSM] Advertise
DEBUG | ??:??:?? 7 [GPS] Trying $PMTK605*31 (MTK Family)...
INFO  | ??:??:?? 7 [GPS] BLE Connected to
DEBUG | ??:??:?? 7 [GPS] BluetoothStatus CONNECTED
INFO  | ??:??:?? 7 [GPS] BLE connection secured
INFO  | ??:??:?? 8 [GPS] toRadioWriteCb data 0x20025b62, len 4
DEBUG | ??:??:?? 8 [GPS] New ToRadio packet
INFO  | ??:??:?? 8 [GPS] Client wants config, nonce=69420
DEBUG | ??:??:?? 8 [GPS] Got 6 files in manifest
INFO  | ??:??:?? 8 [GPS] Start API client config millis=8274
INFO  | ??:??:?? 8 [GPS] CCCD Updated: 1
INFO  | ??:??:?? 8 [GPS] Notify/Indicate enabled
INFO  | ??:??:?? 8 [GPS] CCCD Updated: 2
INFO  | ??:??:?? 8 [GPS] Notify/Indicate enabled
DEBUG | ??:??:?? 8 [GPS] FromRadio=STATE_SEND_MY_INFO
INFO  | ??:??:?? 8 [GPS] getFromRadio=STATE_SEND_UIDATA
WARN  | ??:??:?? 8 [GPS] No GNSS Module (baudrate 9600)
DEBUG | ??:??:?? 8 Send My NodeInfo
DEBUG | ??:??:?? 8 Send device metadata
DEBUG | ??:??:?? 9 Send channels 8
DEBUG | ??:??:?? 9 Send config: device
DEBUG | ??:??:?? 9 Send config: position
DEBUG | ??:??:?? 9 Send config: power
DEBUG | ??:??:?? 10 Send config: network
DEBUG | ??:??:?? 10 Send config: display
DEBUG | ??:??:?? 10 Send config: lora
DEBUG | ??:??:?? 10 Send config: bluetooth
DEBUG | ??:??:?? 10 Send config: security
DEBUG | ??:??:?? 10 [GPS] Send config: sessionkey
DEBUG | ??:??:?? 10 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | ??:??:?? 10 [GPS] Send module config: mqtt
DEBUG | ??:??:?? 10 [GPS] Send module config: serial
DEBUG | ??:??:?? 10 [GPS] Send module config: ext notification
DEBUG | ??:??:?? 11 [GPS] Send module config: store forward
DEBUG | ??:??:?? 11 [GPS] Send module config: range test
DEBUG | ??:??:?? 11 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | ??:??:?? 11 [GPS] Send module config: telemetry
DEBUG | ??:??:?? 11 [GPS] Send module config: canned message
DEBUG | ??:??:?? 11 [GPS] Send module config: audio
DEBUG | ??:??:?? 11 [GPS] Send module config: remote hardware
DEBUG | ??:??:?? 11 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | ??:??:?? 11 [GPS] Send module config: neighbor info
DEBUG | ??:??:?? 11 [GPS] Send module config: ambient lighting
DEBUG | ??:??:?? 11 [GPS] Send module config: detection sensor
DEBUG | ??:??:?? 12 [GPS] Send module config: paxcounter
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: RAK (108) bytes
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: channels.proto (57) bytes
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: module.proto (117) bytes
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: device.proto (130) bytes
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: config.proto (209) bytes
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
DEBUG | ??:??:?? 12 [GPS] File: nodes.proto (376) bytes
DEBUG | ??:??:?? 12 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
INFO  | ??:??:?? 12 [GPS] Config Send Complete millis=12784
DEBUG | ??:??:?? 12 [GPS] FromRadio=STATE_SEND_PACKETS
INFO  | ??:??:?? 13 [GPS] toRadioWriteCb data 0x20025b62, len 2
DEBUG | ??:??:?? 13 [GPS] New ToRadio packet
DEBUG | ??:??:?? 13 [GPS] Got client heartbeat
DEBUG | ??:??:?? 13 [GPS] FromRadio=STATE_SEND_QUEUE_STATUS, numbytes=6
DEBUG | ??:??:?? 13 [GPS] Trying $PCAS06,0*1B (L76K)...
INFO  | ??:??:?? 13 [GPS] toRadioWriteCb data 0x20025b62, len 4
DEBUG | ??:??:?? 13 [GPS] New ToRadio packet
INFO  | ??:??:?? 13 [GPS] Client wants config, nonce=69421
INFO  | ??:??:?? 13 [GPS] Client only wants node info, skipping other config
DEBUG | ??:??:?? 13 [GPS] Got 6 files in manifest
INFO  | ??:??:?? 13 [GPS] Start API client config millis=13346
DEBUG | ??:??:?? 13 [GPS] Send My NodeInfo
INFO  | ??:??:?? 13 [GPS] BLE notify fromNum
INFO  | ??:??:?? 13 [GPS] BLE notify fromNum
INFO  | ??:??:?? 13 [GPS] Start sending nodeinfos millis=13466
DEBUG | ??:??:?? 13 [GPS] nodeinfo: 2/2
INFO  | ??:??:?? 13 [GPS] Start sending nodeinfos millis=13563
DEBUG | ??:??:?? 13 [GPS] Done sending 2 of 2 nodeinfos millis=13564
DEBUG | ??:??:?? 13 [GPS] FromRadio=STATE_SEND_FILEMANIFEST
INFO  | ??:??:?? 13 [GPS] Config Send Complete millis=13567
INFO  | ??:??:?? 13 [GPS] toRadioWriteCb data 0x20025b62, len 48
DEBUG | ??:??:?? 13 [GPS] New ToRadio packet
DEBUG | ??:??:?? 13 [GPS] PACKET FROM PHONE (id=0x89f31c5c fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=1, HopLim=3 Ch=0x0 Portnum=6 hopStart=3 priority=70)
DEBUG | ??:??:?? 13 [GPS] Enqueued local (id=0x89f31c5c fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=1, HopLim=3 Ch=0x0 Portnum=6 hopStart=3 priority=70)
INFO  | ??:??:?? 13 Tell client we have new packets 2
INFO  | ??:??:?? 13 BLE notify fromNum
INFO  | ??:??:?? 13 [Router] Packet History - insert: Using new slot @uptime 13.774s TRACE NEW
DEBUG | ??:??:?? 13 [Router] handleReceived(REMOTE) (id=0x89f31c5c fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=1, HopLim=3 Ch=0x0 Portnum=6 hopStart=3 priority=70)
DEBUG | ??:??:?? 13 [Router] Module 'Admin' wantsPacket=1
INFO  | ??:??:?? 13 [Router] Received Admin from=0x0, id=0x89f31c5c, portnum=6, payloadlen=17
INFO  | ??:??:?? 13 [Router] Handle admin payload 43
INFO  | ??:??:?? 13 [Router] Client received set_time_only command
DEBUG | ??:??:?? 13 [Router] Upgrade time to quality NTP
DEBUG | 09:29:52 13 [Router] Module 'Admin' considered
DEBUG | 09:29:52 13 [Router] Module 'routing' wantsPacket=1
INFO  | 09:29:52 13 [Router] Received routing from=0x0, id=0x89f31c5c, portnum=6, payloadlen=17
DEBUG | 09:29:52 13 [Router] Routing sniffing (id=0x89f31c5c fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=1, HopLim=3 Ch=0x0 Portnum=6 hopStart=3 priority=70)
DEBUG | 09:29:52 13 [Router] Initial packet id 137163260
DEBUG | 09:29:52 13 [Router] Partially randomized packet id 2812894717
DEBUG | 09:29:52 13 [Router] Enqueued local (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 priority=1
DEBUG | 09:29:52 13 [Router] Module 'routing' considered
DEBUG | 09:29:52 13 [Router] FromRadio=STATE_SEND_PACKETS
DEBUG | 09:29:52 13 [Router] Rx someone rebroadcasting for us (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=177
DEBUG | 09:29:52 13 [Router] Didn't find pending packet
INFO  | 09:29:52 13 [Router] Packet History - insert: Using new slot @uptime 13.813s TRACE NEW
DEBUG | 09:29:52 13 [Router] handleReceived(REMOTE) (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 pr
DEBUG | 09:29:52 13 [Router] Module 'routing' wantsPacket=1
INFO  | 09:29:52 13 [Router] Received routing from=0x819e55b6, id=0xa7a95dfd, portnum=5, payloadlen=2
DEBUG | 09:29:52 13 [Router] Routing sniffing (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 priority
DEBUG | 09:29:52 13 [Router] Received a ACK for 0x89f31c5c, stopping retransmissions
DEBUG | 09:29:52 13 [Router] Delivering rx packet (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 prio
DEBUG | 09:29:52 13 [Router] Ignore update from self
DEBUG | 09:29:52 13 [Router] Forwarding to phone (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 prior
DEBUG | 09:29:52 13 [Router] Module 'routing' considered
INFO  | 09:29:52 13 Tell client we have new packets 3
INFO  | 09:29:52 13 BLE notify fromNum
DEBUG | 09:29:52 13 [GPS] Trying $PMTK605*31 (MTK Family)...
DEBUG | 09:29:52 13 [GPS] FromRadio=STATE_SEND_PACKETS
DEBUG | 09:29:52 13 [GPS] phone downloaded packet (id=0xa7a95dfd fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=2 Ch=0x0 Portnum=5 requestId=89f31c5c rxtime=1773480592 p
INFO  | 09:29:52 14 [GPS] toRadioWriteCb data 0x20025b62, len 29
DEBUG | 09:29:52 14 [GPS] New ToRadio packet
DEBUG | 09:29:52 14 [GPS] PACKET FROM PHONE (id=0x00000000 fr=0x819e55b6 to=0x819e55b6, transport = 0, WantAck=0, HopLim=0 Ch=0x0 Portnum=65 priority=10)
DEBUG | 09:29:52 14 [GPS] Partially randomized packet id 1439587838
DEBUG | 09:29:52 14 [GPS] Enqueued local (id=0x55ce5dfe fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=0, HopLim=0 Ch=0x0 Portnum=65 rxtime=1773480592 priority=10)
DEBUG | 09:29:52 14 [GPS] FromRadio=STATE_SEND_PACKETS
WARN  | 09:29:53 15 [GPS] No GNSS Module (baudrate 115200)
INFO  | 09:29:53 15 Tell client we have new packets 4
INFO  | 09:29:53 15 BLE notify fromNum
INFO  | 09:29:53 15 [Router] Packet History - insert: Using new slot @uptime 15.137s TRACE NEW
DEBUG | 09:29:53 15 [Router] handleReceived(REMOTE) (id=0x55ce5dfe fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=0, HopLim=0 Ch=0x0 Portnum=65 rxtime=1773480593 priority=10)
DEBUG | 09:29:53 15 [Router] Module 'routing' wantsPacket=1
INFO  | 09:29:53 15 [Router] Received routing from=0x0, id=0x55ce5dfe, portnum=65, payloadlen=9
DEBUG | 09:29:53 15 [Router] Routing sniffing (id=0x55ce5dfe fr=0x00000000 to=0x819e55b6, transport = 0, WantAck=0, HopLim=0 Ch=0x0 Portnum=65 rxtime=1773480593 priority=10)
DEBUG | 09:29:53 15 [Router] Module 'routing' considered
DEBUG | 09:29:55 17 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:29:56 17 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:29:56 18 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:29:57 19 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:29:58 19 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:29:58 20 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:29:59 21 [GPS] No GNSS Module (baudrate 38400)
DEBUG | 09:30:02 23 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:02 24 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:03 25 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:04 26 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:04 26 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:30:05 27 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:30:06 28 [GPS] No GNSS Module (baudrate 9600)
DEBUG | 09:30:08 30 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:09 31 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:09 31 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:10 32 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:11 33 [GPS] Trying $PCAS06,0*1B (L76K)...
INFO  | 09:30:11 33 [NodeInfo] Send our nodeinfo to mesh (wantReplies=0)
INFO  | 09:30:11 33 [NodeInfo] Send owner !819e55b6/Low Fell Mobile ####/Tesm
DEBUG | 09:30:11 33 [NodeInfo] Partially randomized packet id 641135103
DEBUG | 09:30:11 33 [NodeInfo] Ignore update from self
DEBUG | 09:30:11 33 [NodeInfo] handleReceived(LOCAL) (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x0 Portnum=4 rxtime=1773480611 priority=10)
DEBUG | 09:30:11 33 [NodeInfo] No modules interested in portnum=4, src=LOCAL
INFO  | 09:30:11 33 [NodeInfo] Packet History - insert: Using new slot @uptime 33.704s TRACE NEW
DEBUG | 09:30:11 33 [NodeInfo] Expand short PSK #1
DEBUG | 09:30:11 33 [NodeInfo] Use AES128 key!
DEBUG | 09:30:11 33 [NodeInfo] enqueue for send (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x8 encrypted len=107 rxtime=1773480611 hopStart=3 relay=0x
DEBUG | 09:30:11 33 [NodeInfo] txGood=0,txRelay=0,rxGood=0,rxBad=0
INFO  | 09:30:11 33 Tell client we have new packets 5
INFO  | 09:30:11 33 BLE notify fromNum
DEBUG | 09:30:11 33 [GPS] Trying $PMTK605*31 (MTK Family)...
DEBUG | 09:30:12 33 [GPS] FromRadio=STATE_SEND_PACKETS
DEBUG | 09:30:12 34 [RadioIf] Started Tx (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x8 encrypted len=107 rxtime=1773480611 hopStart=3 relay=0xb6 pri
DEBUG | 09:30:12 34 [RadioIf] 0 packets remain in the TX queue
WARN  | 09:30:13 35 [GPS] No GNSS Module (baudrate 115200)
DEBUG | 09:30:13 35 [RadioIf] Packet TX: 1050ms
DEBUG | 09:30:13 35 [RadioIf] Completed sending (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x8 encrypted len=107 rxtime=1773480611 hopStart=3 relay=0
DEBUG | 09:30:15 37 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:15 37 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:16 38 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:17 39 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:18 39 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:30:18 40 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:30:19 41 [GPS] No GNSS Module (baudrate 38400)
DEBUG | 09:30:20 42 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:20 42 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:21 43 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:22 44 [RadioIf] Corrected frequency offset: 1147.968750
DEBUG | 09:30:22 44 [RadioIf] Lora RX (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=2 Ch=0x8 encrypted len=107 rxSNR=7.5 rxRSSI=-46 hopStart=3 relay=0xb0)
DEBUG | 09:30:22 44 [RadioIf] Packet RX: 1050ms
DEBUG | 09:30:22 44 [Router] Rx someone rebroadcasting for us (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 1, WantAck=0, HopLim=2 Ch=0x8 encrypted len=107 rxSNR=7.5 rxRSSI=-46
DEBUG | 09:30:22 44 [Router] Didn't find pending packet
INFO  | 09:30:22 44 [Router] Packet History - insert: Reusing slot aged 10.552s TRACE MATCHED PACKET
DEBUG | 09:30:22 44 [Router] Ignore dupe incoming msg (id=0x2636f1ff fr=0x819e55b6 to=0xffffffff, transport = 1, WantAck=0, HopLim=2 Ch=0x8 encrypted len=107 rxSNR=7.5 rxRSSI=-46 hopStart
DEBUG | 09:30:22 44 [Router] cancelSending id=0x2636f1ff, removed=0
DEBUG | 09:30:22 44 [Router] Incoming msg was filtered from 0x819e55b6
DEBUG | 09:30:22 44 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:22 44 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:30:23 45 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:30:24 46 [GPS] No GNSS Module (baudrate 4800)
DEBUG | 09:30:27 48 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:27 49 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:28 49 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:29 50 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:29 51 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:30:30 51 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:30:31 53 [GPS] No GNSS Module (baudrate 57600)
DEBUG | 09:30:33 55 [GPS] Trying $PDTINFO (Unicore Family)...
DEBUG | 09:30:34 56 [GPS] Trying $PCAS06,1*1A (ATGM33xx Family)...
DEBUG | 09:30:34 56 [GPS] Trying $PAIR021*39 (Airoha Family)...
DEBUG | 09:30:35 57 [GPS] Trying $PQTMVERNO*58 (LC86)...
DEBUG | 09:30:36 58 [GPS] Trying $PCAS06,0*1B (L76K)...
DEBUG | 09:30:36 58 [GPS] Trying $PMTK605*31 (MTK Family)...
WARN  | 09:30:38 59 [GPS] No GNSS Module (baudrate 9600)
WARN  | 09:30:38 59 [GPS] Give up on GPS probe and set to 9600
INFO  | 09:30:41 63 [DeviceTelemetry] Send: air_util_tx=0.029167, channel_utilization=3.500000, battery_level=101, voltage=4.225000, uptime=63
DEBUG | 09:30:41 63 [DeviceTelemetry] Partially randomized packet id 3578302976
DEBUG | 09:30:41 63 [DeviceTelemetry] updateTelemetry LOCAL
DEBUG | 09:30:41 63 [DeviceTelemetry] Node status update: 1 online, 2 total
INFO  | 09:30:41 63 [DeviceTelemetry] Send packet to phone
INFO  | 09:30:41 63 [DeviceTelemetry] Sending local stats: uptime=63, channel_utilization=3.500000, air_util_tx=0.029167, num_online_nodes=1, num_total_nodes=2
INFO  | 09:30:41 63 [DeviceTelemetry] num_packets_tx=1, num_packets_rx=1, num_packets_rx_bad=0
DEBUG | 09:30:41 63 [DeviceTelemetry] Partially randomized packet id 880486913
INFO  | 09:30:41 63 Tell client we have new packets 7
INFO  | 09:30:41 63 BLE notify fromNum
DEBUG | 09:30:41 63 FromRadio=STATE_SEND_PACKETS
DEBUG | 09:30:41 63 phone downloaded packet (id=0xd5489200 fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x0 Portnum=67 rxtime=1773480641 priority=10)
DEBUG | 09:30:41 63 FromRadio=STATE_SEND_PACKETS
DEBUG | 09:30:41 63 phone downloaded packet (id=0x347b2a01 fr=0x819e55b6 to=0xffffffff, transport = 0, WantAck=0, HopLim=3 Ch=0x0 Portnum=67 rxtime=1773480641 priority=10)
DEBUG | 09:30:42 64 [Power] Battery: usbPower=1, isCharging=1, batMv=4229, batPct=100

[garthvh]

I2C is not used for gps

[mowaxuk]

I2C is not used for gps

• If I2C isn't used, why does the firmware show No I2C devices found at boot before GPS probing even starts?

• The RAK12500 ZOE-M8Q supports UART — what UART pins should Meshtastic be using for Slot A on the RAK19001?

• Is the 3V3_S power rail being enabled before UART probing begins?

[fifieldt]

Confirming we don't support I2C gps. That chip works fine via uart. There are some strange slot things with the rak boards, you may need to use a different slot or set appropriate gpio pins through the app.

[b8b8]

• i2c is used for sensors, not GPS. GPS is UART.
• keep the pins set to zero, that will default to the correct ones. Slot A for GPS is NOT supported as per the official Meshtastic docs
• N/A, everything should work correctly when set according to the docs.

i2c is used for all the sensors (so the board checks for temp, humidity, etc. sensors at boot), gps is always uart in meshtastic firmware.
https://meshtastic.org/docs/configuration/module/telemetry/#currently-supported-sensor-types

https://meshtastic.org/docs/hardware/devices/rak-wireless/wisblock/peripherals/

[mowaxuk]

Thanks for the clarification! That explains a lot. Just to close the loop on why this was so confusing — the RAK documentation for the RAK12500 states that Slot A or Slot C should be used, which is what I had been following when I should have been following the mesh, but I went straight to the RAK docs first, my bad.

The Meshtastic docs say Slot F.
I've now moved the module to Slot F and will report back with results. Hopefully this thread helps anyone else who hits the same issue searching for RAK12500 + RAK19001 + Meshtastic in future.

For reference:

RAK docs (says Slot A or C): https://docs.rakwireless.com/product-categories/wisblock/rak12500/quickstart/
Meshtastic docs (says Slot F): https://meshtastic.org/docs/hardware/devices/rak-wireless/wisblock/peripherals/

[b8b8]

Always go with the Meshtastic docs, theyre edited/written by the devs. RAK boards have many uses beyond Meshtastic so im sure RAK tries to cater to multiple setups by default. 😊

[mowaxuk]

Yup.! totally went down a RAK rabbit hole.! Thanks!

[fifieldt]

Glad it is working. Thanks for writing up your findings for the community!