Multiple Issues Connecting nRF9151 to QM13345 Antenna Switch (No RFFE Support?)

[mystic]

Hello,

I am developing a custom IoT device based on the nRF9151 SiP with a Qorvo QM13345 SP4T antenna switch controlled via RFFE 2.1 interface. All RFFE AT commands fail with error 65536, preventing antenna switch control and resulting in no cellular signal (CSQ: 99,99).

## Hardware Configuration

- **Device**: nRF9151 (nrf9151dk/nrf9151/ns)

- **Antenna Switch**: Qorvo QM13345 SP4T (RFFE 2.1 controlled)

- **Current Modem Firmware**: mfw_nrf91x1_2.0.2

- **SDK**: nRF Connect SDK v3.0.2-89ba1294ac9b

- **Zephyr**: v4.0.99-f791c49f492c

## RFFE Hardware Connections

```

nRF9151          QM13345

Pin 27 -------> SDATA (Pin 5)

Pin 28 -------> SCLK (Pin 6)

Pin 29 -------> VIO (Pin 4)

GND ----------> GND (Pin 7)

```

 **Connections**:

- SDATA (pin 27) → nRF9151 RFFE_SDATA

- SCLK (pin 28) → nRF9151 RFFE_SCLK

- VIO (pin 29) → nRF9151 RFFE_VIO

- RF1 (pin 3) → Main LTE antenna port

- RFC (pin 1) → nRF9151 RF output

QM13345 ID pin connected to solder bridge (SB1/SBI2) for USID configuration.

## Software Configuration

I've enabled Nordic's official modem antenna library:

```kconfig

CONFIG_MODEM_ANTENNA=y

CONFIG_MODEM_ANTENNA_AT_MAGPIO="AT%XMAGPIO=1,0,0,1,1,1574,1577"

CONFIG_MODEM_ANTENNA_AT_MIPIRFFEDEV="AT%XMIPIRFFEDEV=1,7,0"

CONFIG_MODEM_ANTENNA_AT_MIPIRFFECTRL_INIT="AT%XMIPIRFFECTRL=1,0,1,0,1"

CONFIG_MODEM_ANTENNA_AT_MIPIRFFECTRL_ON="AT%XMIPIRFFECTRL=1,1,1,0,1"

CONFIG_MODEM_ANTENNA_AT_MIPIRFFECTRL_OFF="AT%XMIPIRFFECTRL=1,2,1,0,0"

CONFIG_MODEM_ANTENNA_AT_MIPIRFFECTRL_PWROFF="AT%XMIPIRFFECTRL=1,3,1,0,0"

```

## Observed Behavior

During modem initialization, all RFFE configuration attempts fail:

```

[00:00:02.900,329] <err> modem_antenna: Failed to set configuration (err: 65536)

[00:00:02.909,454] <err> modem_antenna: Failed to set configuration (err: 65536)

[00:00:02.924,560] <err> modem_antenna: Failed to set configuration (err: 65536)

[00:00:02.939,697] <err> modem_antenna: Failed to set configuration (err: 65536)

[00:00:02.954,833] <err> modem_antenna: Failed to set configuration (err: 65536)

```

Manual AT command testing confirms RFFE commands are not supported:

```

AT%XMIPIRFFEDEV? → Error 65536

AT%XMIPIRFFE? → Error 65536

AT%XMIPIRFFECTRL=1,0,1,0,1 → Error 65536

AT%XRFTEST? → Error 65536

```

Modem otherwise functions correctly:

- Basic AT commands work (AT, AT+CGMI, etc.)

- SIM card detected and powered (IMSI: 222013423872426)

- Modem enters full functionality mode (CFUN=1) successfully

- No cellular signal: CSQ returns 99,99 (no signal detected)

## Comparison with Nordic Reference Design

I noticed the Thingy:91 X (PCA20035) with nRF9151 successfully uses RFFE commands in its configuration:

From `/home/nrf/boards/nordic/thingy91x/Kconfig.defconfig.nrf9151`:

```kconfig

config MODEM_ANTENNA_AT_MIPIRFFEDEV

    default "AT%XMIPIRFFEDEV=1,4,71,198,248"

config MODEM_ANTENNA_AT_MIPIRFFECTRL_INIT

    default "AT%XMIPIRFFECTRL=1,0,1,28,248"

config MODEM_ANTENNA_AT_MIPIRFFECTRL_ON

    default "AT%XMIPIRFFECTRL=1,1,1,28,56,13,0,0,8,8,715,4,4,770,12,12,829..."

```

This confirms that nRF9151 SHOULD support RFFE commands for antenna switch control.

## Questions

1. **Does modem firmware 2.0.2 support RFFE 2.1 commands?**

   - If not, which firmware version first introduced RFFE support?

   - Is there a firmware update roadmap for RFFE support on nRF9151?

2. **How does the Thingy:91 X control its antenna switch with nRF9151?**

   - Does it use a different modem firmware version?

   - Are there any special modem configuration steps required?

3. **Is there an alternative method to control RFFE devices on nRF9151?**

   - Can MAGPIO be used as a fallback for antenna switching?

   - Are there any undocumented AT commands for RF path control?

4. **What is the recommended approach for antenna switching on nRF9151?**

   - Should I use RFFE-controlled switches (QM13345)?

   - Or should I use GPIO-controlled switches (SKY13453, PE42423)?

## Additional Information

I've tested both production firmware 2.0.2 and production test firmware 2.3.8:

- **2.0.2**: RFFE commands fail with error 65536

- **2.3.8**: PTI firmware blocks most AT commands (restricted mode for factory testing)

The hardware design follows the QM13345 datasheet requirements:

- RFFE 2.1 interface properly connected

- VIO decoupling capacitor present

- Proper grounding

- ID pin configured for USID=0x7 (GND connection)

## Expected Outcome

I need to successfully control the QM13345 antenna switch to route RF signals from the nRF9151 modem (RFC) to the main antenna (RF1 port). This is blocking cellular connectivity testing.

## Request

Please provide:

1. Confirmation of RFFE support status in nRF9151 firmware versions

2. Recommended firmware version for RFFE-controlled antenna switches

3. Example configuration or AT command sequence for QM13345 control

4. Timeline for RFFE support if not currently available

## Attachments

- Full RTT log showing RFFE command failures

- Hardware schematic (relevant RFFE section)

- prj.conf configuration file

Thank you for your assistance.

Fullscreen 1777.RTT_log.txt Download

(Connection lost)
00> [00:00:00.397,033] <inf> LSM6DSO: Initialize device lsm6dso@6b
00> [00:00:00.404,602] <inf> LSM6DSO: chip id 0x6a
00> [00:00:00.409,973] <err> nt3h2111: I2C read failed: -5
00> [00:00:00.416,168] <err> nt3h2111: Failed to read configuration: -5
00> [00:00:00.423,522] <wrn> nt3h2111: NT3H2111 may not be physically connected, continuing with defaults
00> [00:00:00.439,453] <inf> veml6030: VEML6030 initialized successfully
00> *** Booting My Application v1.0.0-704e3ba7cb7b ***
00> *** Using nRF Connect SDK v3.0.2-89ba1294ac9b ***
00> *** Using Zephyr OS v4.0.99-f791c49f492c ***
00> [00:00:00.460,021] <inf> main_app: Starting Multi-Sensor IoT Device Firmware
00> [00:00:00.467,895] <inf> main_app: Skipping config manager init for debugging
00> [00:00:00.475,860] <inf> main_app: Data transmission interval set to 60 seconds
00> [00:00:00.484,039] <inf> battery_monitor: Battery monitor initialized (LTC4060 charger)
00> [00:00:00.492,919] <inf> main_app: Battery m[00:00:02.648,162] <inf> main_app: Calling nrf_modem_lib_init()...
00> [00:00:02.902,191] <err> modem_antenna: Failed to set configuration (err: 65536)
00> [00:00:02.911,254] <err> modem_antenna: Failed to set configuration (err: 65536)
00> [00:00:02.926,391] <err> modem_antenna: Failed to set configuration (err: 65536)
00> [00:00:02.941,467] <err> modem_antenna: Failed to set configuration (err: 65536)
00> [00:00:02.956,573] <err> modem_antenna: Failed to set configuration (err: 65536)
00> [00:00:02.986,389] <inf> main_app: nrf_modem_lib_init() returned: 0
00> [00:00:02.993,469] <inf> main_app: Modem library initialized successfully
00> [00:00:03.001,098] <inf> main_app: Waiting for modem to be fully ready...
00> [00:00:13.008,728] <wrn> main_app: Modem ready timeout - proceeding anyway
00> [00:00:16.016,754] <inf> main_app: Testing AT interface (attempt 2)...
00> [00:00:16.030,456] <inf> main_app: Modem responding: OK
00> 
00> [00:00:16.036,651] <inf> main_app: Getting modem information...
00> [00:00:16.049,926] <wrn> main_app: Failed to get modem info (err=65536)
00> [00:00:16.064,147] <inf> main_app: Manufacturer: Nordic Semiconductor ASA
00> OK
00> 
00> [00:00:16.078,765] <inf> main_app: Modem firmware version: mfw_nrf91x1_2.0.2
00> OK
00> 
00> [00:00:16.087,219] <inf> main_app: === CHECKING RFFE COMMAND SUPPORT ===
00> [00:00:16.101,379] <wrn> main_app: XMIPIRFFEDEV not supported (err=65536)
00> [00:00:16.115,936] <wrn> main_app: XMIPIRFFE not supported (err=65536)
00> [00:00:16.130,218] <wrn> main_app: XRFTEST not supported (err=65536)
00> [00:00:16.144,317] <wrn> main_app: %XRFTEST not supported (err=65536)
00> [00:00:16.158,477] <wrn> main_app: %XMIPIRFFE not supported (err=65536)
00> [00:00:16.166,198] <inf> main_app: === END RFFE COMMAND CHECK ===
00> [00:00:16.173,095] <err> main_app: ====================================
00> [00:00:16.180,786] <err> main_app: CRITICAL HARDWARE ISSUE DETECTED!
00> [00:00:16.188,232] <err> main_app: ====================================
00> [00:00:16.195,953] <err> main_app: QM13345 antenna switch requires RFFE 2.1 protocol
00> [00:00:16.204,833] <err> main_app: nRF9151 modem firmware 2.0.2 does NOT support RFFE
00> [00:00:16.213,806] <err> main_app: Without RFFE, the antenna switch cannot be controlled
00> [00:00:16.223,052] <err> main_app: The switch may be in an undefined/OFF state
00> [00:00:16.231,384] <err> main_app: 
00> [00:00:16.235,839] <err> main_app: WORKAROUND ATTEMPT:
00> [00:00:16.242,004] <err> main_app: The QM13345 ID pin configuration may set a default state
00> [00:00:16.251,525] <err> main_app: Your board has ID pin connected to solder bridge SB1/SBI2
00> [00:00:16.261,138] <err> main_app: Check if the solder bridge routes to GND (USID=0x7)
00> [00:00:16.270,172] <err> main_app: ====================================
00> [00:00:16.284,301] <inf> main_app: CFUN state check succeeded: +CFUN: 0
00> OK
00> 
00> [00:00:16.292,297] <wrn> main_app: Modem is in offline/airplane mode - needs activation!
00> [00:00:16.301,544] <inf> main_app: Configuring cellular connection for Telnyx (APN: data00.telnyx)...
00> [00:00:16.311,676] <inf> main_app: Following Nordic forum recommended sequence...
00> [00:00:16.320,007] <inf> main_app: Step 1: Setting CFUN=0 to disable radio...
00> [00:00:16.365,478] <inf> main_app: Radio disabled: OK
00> 
00> [00:00:17.371,520] <inf> main_app: Step 2: Setting automatic operator selection (AT+COPS=0)...
00> [00:00:17.387,542] <inf> main_app: Operator selection set to automatic: OK
00> 
00> [00:00:17.395,446] <inf> main_app: Step 3: Setting system mode (LTE-M and NB-IoT)...
00> [00:00:17.410,705] <wrn> main_app: System mode config failed (err=65536)
00> [00:00:17.418,518] <inf> main_app: Step 4: Configuring Telnyx APN (data00.telnyx)...
00> [00:00:17.433,685] <inf> main_app: APN configured: OK
00> 
00> [00:00:17.439,666] <inf> main_app: Step 7: Activating modem (AT+CFUN=1)...
00> [00:00:17.447,387] <inf> main_app: No search commands active - safe to activate!
00> [00:00:17.500,762] <inf> main_app: CFUN=1 set successfully: OK
00> 
00> [00:00:17.507,568] <inf> main_app: Waiting for modem to stabilize...
00> [00:00:20.514,801] <inf> main_app: Verifying modem state...
00> [00:00:20.521,484] <inf> main_app: SUCCESS: Modem is in full functionality mode
00> [00:00:20.529,632] <inf> main_app: Enabling SIM card power supply...
00> [00:00:20.536,773] <inf> main_app: Forcing SIM card power enable...
00> [00:00:20.544,219] <inf> main_app: Network registration notifications enabled: OK
00> 
00> [00:00:20.553,283] <wrn> main_app: XSIM not supported (err=65536)
00> [00:00:20.560,455] <inf> main_app: Triggering SIM communication to enable power...
00> [00:00:20.569,274] <inf> main_app: IMSI read (forces SIM power): 222013423872426
00> OK
00> 
00> [00:00:20.579,040] <wrn> main_app: XICCID failed (err=65536)
00> [00:00:20.585,784] <inf> main_app: Ensuring modem is in full functionality mode...
00> [00:00:20.594,543] <inf> main_app: Current CFUN state: +CFUN: 1
00> OK
00> 
00> [00:00:20.601,806] <inf> main_app: Querying SIM status multiple times to ensure power...
00> [00:00:21.111,236] <inf> main_app: SIM status attempt 1: +CPIN: READY
00> OK
00> 
00> [00:00:21.119,049] <inf> main_app: SIM detected and powered!
00> [00:00:22.125,518] <inf> main_app: =====================================
00> [00:00:22.133,026] <inf> main_app: SIM POWER STATUS:
00> [00:00:22.138,763] <inf> main_app: =====================================
00> [00:00:22.146,270] <inf> main_app: IMPORTANT: Pin 19 (SIM_1V8) only outputs voltage during SIM communication!
00> [00:00:22.157,135] <inf> main_app: The voltage will appear when modem actively talks to SIM.
00> [00:00:22.166,473] <inf> main_app: RST showing -1.8V indicates partial SIM interface activation.
00> [00:00:22.176,147] <inf> main_app: Please measure NOW while firmware is running:
00> [00:00:22.184,387] <inf> main_app:   - SIM VCC (pin C1): Should show 1.8V during communication
00> [00:00:22.193,908] <inf> main_app:   - SIM RST (pin C2): -1.8V is normal (active low)
00> [00:00:22.202,575] <inf> main_app: =====================================
00> [00:00:22.710,510] <inf> main_app: SIM detection after power enable: +CPIN: READY
00> OK
00> 
00> [00:00:22.719,390] <inf> main_app: SUCCESS: SIM card detected and ready!
00> [00:00:22.726,928] <inf> main_app: ====================================
00> [00:00:22.734,344] <err> main_app: ANTENNA SWITCH ISSUE DETECTED!
00> [00:00:22.741,485] <inf> main_app: ====================================
00> [00:00:22.748,931] <err> main_app: QM13345 uses RFFE 2.1 protocol
00> [00:00:22.756,072] <err> main_app: nRF9151 firmware 2.0.2 does NOT support RFFE commands
00> [00:00:22.765,319] <err> main_app: The antenna switch cannot be properly controlled!
00> [00:00:22.774,200] <inf> main_app: Attempting workarounds...
00> [00:00:22.781,280] <wrn> main_app: XMIPIRFFEDEV failed (err=65536) - device may already be configured
00> [00:00:22.792,449] <wrn> main_app: XMIPIRFFECTRL INIT failed (err=65536)
00> [00:00:22.800,964] <wrn> main_app: XMIPIRFFECTRL ON failed (err=65536)
00> [00:00:22.809,448] <wrn> main_app: XMIPIRFFEDBG read failed (err=65536)
00> [00:00:22.818,115] <wrn> main_app: XANTCFG failed (err=65536)
00> [00:00:22.824,951] <inf> main_app: ====================================
00> [00:00:22.832,397] <err> main_app: RFFE Configuration FAILED - Commands Not Supported!
00> [00:00:22.841,430] <err> main_app: QM13345 antenna switch is NOT properly configured
00> [00:00:22.850,311] <inf> main_app: ====================================
00> [00:00:22.857,727] <inf> main_app: Attempting alternative antenna configuration methods...
00> [00:00:22.867,431] <wrn> main_app: MAGPIO not available (err=65536)
00> [00:00:22.875,335] <wrn> main_app: Cannot get antenna tuning (err=65536)
00> [00:00:22.883,148] <inf> main_app: ====================================
00> [00:00:22.890,594] <err> main_app: CRITICAL: HARDWARE INCOMPATIBILITY
00> [00:00:22.898,101] <err> main_app: ====================================
00> [00:00:22.905,792] <err> main_app: Problem: QM13345 antenna switch requires RFFE 2.1 protocol
00> [00:00:22.915,496] <err> main_app: Issue: nRF9151 firmware 2.0.2 does NOT support RFFE
00> [00:00:22.924,530] <err> main_app: Result: Antenna switch stuck in unknown/OFF state
00> [00:00:22.933,380] <err> main_app: 
00> [00:00:22.937,835] <err> main_app: POSSIBLE SOLUTIONS:
00> [00:00:22.944,030] <err> main_app: 1. Hardware modification: Bypass QM13345 (connect RFC to RF1 directly)
00> [00:00:22.954,772] <err> main_app: 2. Add pull-up resistor on V1 (pin 8) to force RF1 selection
00> [00:00:22.964,660] <err> main_app: 3. Wait for Nordic to release RFFE-enabled firmware
00> [00:00:22.973,693] <err> main_app: 4. Use external GPIO to control V1-V4 pins (requires PCB rework)
00> [00:00:22.983,917] <err> main_app: ====================================
00> [00:00:23.092,803] <inf> main_app: Checking RF test mode capabilities...
00> [00:00:23.100,982] <wrn> main_app: RF test mode not available (err=65536)
00> [00:00:23.109,252] <inf> main_app: Radio functionality: +CFUN: 1
00> OK
00> 
00> [00:00:23.116,607] <inf> main_app: Radio is enabled (CFUN=1)
00> [00:00:23.123,626] <inf> main_app: RF switch configuration attempts completed
00> [00:00:23.131,591] <inf> main_app: ====================================
00> [00:00:23.139,038] <inf> main_app: ====================================
00> [00:00:23.146,453] <inf> main_app: QUICK SIGNAL CHECK BEFORE ATTACHMENT
00> [00:00:23.153,869] <inf> main_app: ====================================
00> [00:00:23.161,743] <inf> main_app: Signal strength: +CSQ: 99,99
00> OK
00> 
00> [00:00:23.169,006] <wrn> main_app: NO SIGNAL DETECTED (CSQ: 99,99)
00> [00:00:23.176,239] <wrn> main_app: Check antenna connection!
00> [00:00:23.183,288] <inf> main_app: SIM status: +CPIN: READY
00> OK
00> 
00> [00:00:23.190,185] <inf> main_app: ====================================
00> [00:00:23.197,631] <inf> main_app: Step 8: Waiting for network attachment (AT+CGATT)...
00> [00:00:23.206,909] <inf> main_app: [Attempt 1/30] Not attached yet: +CGATT: 0
00> OK
00> 
(Connection lost)

5305.prj.conf

[Maximilian Deubel]

Hi!

We are using this configuration with the Thingy:91 X successfully. The modem firmware does support RFFE and uses it actively to control the LTE and GNSS antenna circuitry. You can check the modem antenna KConfig values used for the official board:

config MODEM_ANTENNA_AT_MIPIRFFEDEV
	default "AT%XMIPIRFFEDEV=1,4,71,198,248"
config MODEM_ANTENNA_AT_MIPIRFFECTRL_INIT
	default "AT%XMIPIRFFECTRL=1,0,1,28,248"
config MODEM_ANTENNA_AT_MIPIRFFECTRL_ON
	default "AT%XMIPIRFFECTRL=1,1,1,28,56,13,0,0,8,8,715,4,4,770,12,12,829,11,11,863,130,130,892,1,1,939,129,129,978,26,26,1042,8,8,1118,4,4,1270,12,12,1386,14,14,1523,130,130,2200"
config MODEM_ANTENNA_AT_MIPIRFFECTRL_OFF
	default "AT%XMIPIRFFECTRL=1,2,1,28,184"
config MODEM_ANTENNA_AT_MIPIRFFECTRL_PWROFF
	default "AT%XMIPIRFFECTRL=1,3,1,28,184"
config MODEM_ANTENNA_AT_COEX0
	default "AT\%XCOEX0=1,1,1565,1586"

The "Failed to set configuration" configuration issue occurs because the AT commands in the configuration are invalid.

Don't use both MAGPIO + RFFE. Specifically AT_MIPIRFFEDEV and AT_MIPIRFFECTRL_ON are invalid.

Please take a step back and try to solve the issue without an LLM. What are you trying to accomplish? Do you have a table with frequencies and switch configurations? Is there a specific reason to change the configuration from the one for Thingy:91 X? The schematic is nearly identical.

Best regards,

Max.

[mystic]

Hey thanks for your input. I took your advice for the KConfig values and defaulted strictly to MAGPIO. However I'm still getting a 99,99 for the CSQ and I'm not sure why. Here's the log:

00> [00:00:00.400,024] <inf> LSM6DSO: Initialize device lsm6dso@6b
00> [00:00:00.407,684] <inf> LSM6DSO: chip id 0x6a
00> *** Booting My Application v1.0.0-704e3ba7cb7b ***
00> *** Using nRF Connect SDK v3.0.2-89ba1294ac9b ***
00> *** Using Zephyr OS v4.0.99-f791c49f492c ***
00> [00:00:00.426,513] <inf> magpio_test: ========================================
00> [00:00:00.434,661] <inf> magpio_test: MAGPIO Configuration Test
00> [00:00:00.441,467] <inf> magpio_test: ========================================
00> [00:00:00.449,615] <inf> magpio_test: Testing if MAGPIO configuration is needed
00> [00:00:00.457,855] <inf> magpio_test: for nRF9151 RF operation
00> [00:00:00.464,538] <inf> magpio_test: ========================================
00> [00:00:00.472,686] <inf> magpio_test: 
00> [00:00:02.477,233] <inf> magpio_test: Initializing modem...
00> [00:00:02.739,227] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XCOEX0=1,1,1565,1586
00> [00:00:02.757,202] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XMIPIRFFEDEV=1,7,71,198,248
00> [00:00:02.775,817] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XMIPIRFFECTRL=1,0,1,28,248
00> [00:00:02.794,372] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XMIPIRFFECTRL=1,1,1,28,56,13,0,0,8,8,715,4,4,770,12,12,829,11,11,863,130,130,892,1,1,939,129,129,978,26,26,1042,8,8,1118,4,4,1270,12,12,1386,14,14,1523,130,130,2200
00> [00:00:02.825,805] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XMIPIRFFECTRL=1,2,1,28,184
00> [00:00:02.844,390] <dbg> modem_antenna: set_antenna_configuration: Setting configuration: AT%XMIPIRFFECTRL=1,3,1,28,184
00> [00:00:02.864,349] <inf> magpio_test: Modem initialized
00> [00:00:02.870,391] <inf> magpio_test: 
00> [00:00:03.874,969] <inf> magpio_test: Checking current MAGPIO configuration:
00> [00:00:03.889,556] <inf> magpio_test:   Current MAGPIO: %XMAGPIO: 1,0,0,1,1,1574,1577
00> OK
00> 
00> 
00> [00:00:03.898,925] <inf> magpio_test: 
00> [00:00:03.903,411] <inf> magpio_test: Current COEX0 configuration:
00> [00:00:03.917,083] <inf> magpio_test:   %XCOEX0: 1,1,1565,1586
00> OK
00> 
00> [00:00:03.924,316] <inf> magpio_test: 
00> [00:00:03.928,833] <inf> magpio_test: Current RFFE configuration:
00> [00:00:03.943,115] <inf> magpio_test:   %XMIPIRFFEDEV: 1,7,71,198,248
00> INIT: 1,0,1,28,248
00> ON: 1,1,1,28,56,13,0,0,8,8,715,4,4,770,12,12,829,11,11,863,130,130,892,1,1,939,129,129,978,26,26,1042,8,8,1118,4,4,1270,12,12,1386,14,14,1523,130,130,2200
00> OFF: 1,2,1,28,184
00> PWROFF: 1,3,1,28,184
00> OK
00> 
00> [00:00:03.970,855] <inf> magpio_test: 
00> [00:00:03.975,341] <inf> magpio_test: ========================================
00> [00:00:03.983,489] <inf> magpio_test: Attempting MAGPIO Configuration
00> [00:00:03.990,844] <inf> magpio_test: ========================================
00> [00:00:03.998,962] <inf> magpio_test: 
00> [00:00:04.003,479] <inf> magpio_test: Configuring MAGPIO (nRF9160 DK style)...
00> [00:00:04.018,218] <inf> magpio_test:   MAGPIO configured: OK
00> [00:00:04.024,810] <inf> magpio_test:   Response: OK
00> 
00> [00:00:04.030,792] <inf> magpio_test: 
00> [00:00:04.035,278] <inf> magpio_test: Verifying MAGPIO configuration:
00> [00:00:04.049,224] <inf> magpio_test:   New MAGPIO: %XMAGPIO: 1,0,0,1,1,1574,1577
00> OK
00> 
00> [00:00:04.058,227] <inf> magpio_test: 
00> [00:00:04.062,713] <inf> magpio_test: ========================================
00> [00:00:04.070,861] <inf> magpio_test: Activating Modem with MAGPIO
00> [00:00:04.077,911] <inf> magpio_test: ========================================
00> [00:00:04.086,059] <inf> magpio_test: 
00> [00:00:04.090,545] <inf> magpio_test: Setting CFUN=1...
00> [00:00:04.141,723] <inf> magpio_test: Modem activated
00> [00:00:04.147,583] <inf> magpio_test: 
00> [00:00:07.152,160] <inf> magpio_test: ========================================
00> [00:00:07.160,339] <inf> magpio_test: Signal Test (30 seconds)
00> [00:00:07.167,022] <inf> magpio_test: ========================================
00> [00:00:07.175,170] <inf> magpio_test: 
00> [00:00:12.180,175] <inf> magpio_test: [ 5s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:12.187,652] <inf> magpio_test: [ 5s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:12.194,915] <inf> magpio_test: 
00> [00:00:17.199,951] <inf> magpio_test: [10s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:17.207,427] <inf> magpio_test: [10s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:17.214,691] <inf> magpio_test: 
00> [00:00:22.219,665] <inf> magpio_test: [15s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:22.227,142] <inf> magpio_test: [15s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:22.234,436] <inf> magpio_test: 
00> [00:00:27.239,379] <inf> magpio_test: [20s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:27.246,856] <inf> magpio_test: [20s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:27.254,150] <inf> magpio_test: 
00> [00:00:32.259,094] <inf> magpio_test: [25s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:32.266,723] <inf> magpio_test: [25s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:32.274,017] <inf> magpio_test: 
00> [00:00:37.278,961] <inf> magpio_test: [30s] CSQ: +CSQ: 99,99
00> OK
00> 
00> [00:00:37.286,590] <inf> magpio_test: [30s] CEREG: +CEREG: 0,4
00> OK
00> 
00> [00:00:37.293,884] <inf> magpio_test: 
00> [00:00:37.298,370] <inf> magpio_test: ========================================
00> [00:00:37.306,518] <inf> magpio_test: Network Scan Test
00> [00:00:37.312,591] <inf> magpio_test: ========================================
00> [00:00:37.320,739] <inf> magpio_test: Scanning for operators (may take 2 minutes)...
00> [00:00:37.329,406] <inf> magpio_test: 
00> [00:04:32.767,517] <err> magpio_test: Network scan FAILED: 65536
00> [00:04:32.774,719] <err> magpio_test: MAGPIO configuration did not resolve the issue
00> [00:04:32.783,691] <inf> magpio_test: 
00> [00:04:32.788,177] <inf> magpio_test: ========================================
00> [00:04:32.796,325] <inf> magpio_test: Test Complete
00> [00:04:32.802,032] <inf> magpio_test: ========================================

[Øyvind]

Hello, 

Have you gone through our AT commands documentation? A quick search in the AI search tool gives the answer

The CSQ command reports 99,99 when the signal quality is "not detectable" or "not known." This typically happens when the Radio Access Technology (RAT) is not supported (for example, if the modem is not operating in a 2G or 3G network, or if there is no signal available). For LTE and other E-UTRA networks, you should use the +CESQ or %CESQ commands instead, as CSQ is not applicable for those technologies.

What output do you get if you use the +CESQ or %CESQ commands instead?

CEREG: 0,4 - indicates Unknown (for example, out of Evolved Terrestrial Radio Access Network (E-UTRAN) coverage). See Network registration status notification +CEREG for more information

If the issue still persists I would recommend a full hardware review including schematics and layout.

Kind regards,
Øyvind