I'm trying a new tracker code with Lopy and Pytrack + sleep and wake interrupt, but I'm suck with console output problem, so I restarted from library example code accelerometer_wake to reproduce the issue.

I modified a little to have some print and wait to be able to connect terminal (because deep sleep shut down usb device seen in windows)

Here the code

import machine 
from machine import UART
from pytrack import Pytrack
from LIS2HH12 import LIS2HH12
from network import Bluetooth
from network import WLAN
import pycom
import time
import os

uart = UART(0, 115200)
os.dupterm(uart)

WLAN().deinit()
Bluetooth().deinit()

# Wait for terminal to connect
print("Wait for sync ", end='')
for x in range(0, 10):
    print("#", end='')
    time.sleep(1)
print(" OK!", flush=True)

rst = machine.reset_cause()
print("starting, Reset=", rst)

pycom.heartbeat(False)
print("stage 1", flush=True)

py = Pytrack()
print("stage 2", flush=True)

print("Wakeup reason: ", flush=True)
print(py.get_wake_reason())
print("; Aproximate sleep remaining: ", flush=True)
print(py.get_sleep_remaining())
print(" sec", flush=True)

# enable wakeup source from INT pin
py.setup_int_pin_wake_up(False)

# enable activity and also inactivity interrupts, using the default callback handler
py.setup_int_wake_up(True, True)

acc = LIS2HH12()
# enable the activity/inactivity interrupts
# set the accelereation threshold to 2000mG (2G) and the min duration to 200ms
acc.enable_activity_interrupt(2000, 200)

# wait 15 second before deep sleep to be able to upload 
print("Wait for update ", end='', flush=True)
for x in range(0, 15):
    print(".", end='', flush=True)
    time.sleep(1)
print(" OK!", flush=True)

# go to sleep for 30 seconds max if no accelerometer interrupt happens
print("Go to deep sleep...")
py.setup_sleep(30)
py.go_to_sleep()

The fact is that the program works pretty fine (I know this because 15 seconds after printing stage 1 the device goes to deep sleep (windows beep) and wake up after 30s of deep sleep (windows beep agin and device shows up in device manager), Then I reconnect and got display until stage 1 again

Here the output of terminal (I manually disconnect when entering deep sleep and reconnect after deep sleep wake)

What I am missing ? Looks like some system call break the dupterm, I tried to reset console after stage 1 but same things.

py = Pytrack()
uart = UART(0, 115200)
os.dupterm(uart)
print("stage 2", flush=True)

I'm using latest firmware as today 1.17.3.b1 and latest pymakr but also tried with another terminal, same thing

Any idea of what's going wrong there ?

Have you tried adding a pause just after the stage 1 print + another print before instantiating the Pytrack object? Just to see if it's timing-related or directly related to the connection to the Pytrack...

has suggested, I've done the changes, same thing.

Same result

I created a boot.py

from machine import UART
import os

uart = UART(0, 115200)
os.dupterm(uart)

of course removed this line from main.py

it's far better but console still looks up after call to py.get_sleep_remaining()

The calibrate_rtc() in library pycoproc break the console output, if I comment this call from get_sleep_remaining() No problem

Connecting on COM24...
# OK!
starting, Reset= 0
stage 1
stage 2
Wakeup reason:
4
; Aproximate sleep remaining:
calibrate_rtc
0
 sec
stage 4
Wait for update .............

may be the deal is out there

def calibrate_rtc(self):
        # the 1.024 factor is because the PIC LF operates at 31 KHz
        # WDT has a frequency divider to generate 1 ms
        # and then there is a binary prescaler, e.g., 1, 2, 4 ... 512, 1024 ms
        # hence the need for the constant
        self._write(bytes([CMD_CALIBRATE]), wait=False)
        self.i2c.deinit()
        Pin('P21', mode=Pin.IN)
        pulses = pycom.pulses_get('P21', 100)
        self.i2c.init(mode=I2C.MASTER, pins=(self.sda, self.scl))
        idx = 0