RTT does not connect

[Celppu]

I cannot get RTT to connect nrf54L15. I can get RTT viewer in nrf connect to show logs.

When I run the code, second jlink instance is launched. in http://localhost:19080/rtt.htm I see burst of logs via RTT, but second instance from python http://localhost:19081/rtt.htm show nothing - How does the instances work??

code i have been tinkering with:

import pylink
import time
import sys

# Set your known values
SERIAL_NUMBER = 1057703614
DEVICE_NAME = 'nRF54L15_M33' 

# Connect to the J-Link probe
jlink = pylink.JLink()

try:
    print(f"Connecting to J-Link serial {SERIAL_NUMBER}...")
    jlink.open(serial_no=SERIAL_NUMBER)

    #print(f"Connecting to target device: {DEVICE_NAME}...")
    jlink.set_tif(pylink.enums.JLinkInterfaces.SWD)
    jlink.connect(DEVICE_NAME)

    print(f"Connected? {jlink.target_connected()}")

    print("Starting RTT...")
    #0x200009BC
    #jlink.rtt_start(block_address=0x200009BC)
    
    jlink.reset(ms =1)

    time.sleep(0.001)

    jlink.rtt_start(block_address=0x200009BC)

    print(f"RTT started. Waiting for RTT to be ready... {jlink.rtt_get_status()}")


    # Optional: wait for RTT to stabilize
    while True:
        try:
            num_up = jlink.rtt_get_num_up_buffers()
            if num_up > 0:
                break
        except pylink.errors.JLinkRTTException:
            pass
        time.sleep(0.1)

    print("RTT connected. Reading channel 0:\n")

    try:
        while True:
            try:
                if jlink.rtt_get_num_up_buffers() == 0:
                    print("RTT buffers lost. Trying to re-sync...")
                    jlink.rtt_stop()
                    time.sleep(0.1)
                    jlink.rtt_start()
                    continue

                data = jlink.rtt_read(0, 1024)
                if data:
                    print(bytes(data).decode(errors='ignore'), end='')
                else:
                    time.sleep(0.01)

            except pylink.errors.JLinkRTTException:
                print("RTT read error. Reconnecting...")
                jlink.rtt_stop()
                time.sleep(0.1)
                jlink.rtt_start()

    except KeyboardInterrupt:
        print("\nClosing.")
        jlink.close()
except KeyboardInterrupt:
    print("\nKeyboard interrupt received. Closing J-Link...")
    jlink.close()
    sys.exit(0)

except pylink.errors.JLinkException as e:
    print(f"J-Link error: {e}")
    jlink.close()
    sys.exit(1)

[hkpeprah]

Do you have logs?

import logging

logging.basicConfig(level=logging.DEBUG)