OLED display not refreshing.

[joesalty]

Just installed the plugin without problems.
After the restart, the screen shows "Initialized/ B:22_ To:23_"
Started a new print, but the screen did not refreshed, just stucked there.
In log I see the followings:
2024-01-18 23:35:10,016 - octoprint.printer.standard - ERROR - Exception while pushing current data to callback <octoprint_ssd1306oleddisplay.Ssd1306_oled_displayPlugin object at 0x71a63658> Traceback (most recent call last): File "/home/xxxxxxxxx/oprint/lib/python3.9/site-packages/octoprint/printer/standard.py", line 251, in _sendCurrentDataCallbacks callback.on_printer_send_current_data(data_copy) File "/home/xxxxxxxxx/oprint/lib/python3.9/site-packages/octoprint_ssd1306oleddisplay/__init__.py", line 81, in on_printer_send_current_data format_seconds(data['progress']['printTimeLeft']), File "/home/xxxxxxxxx/oprint/lib/python3.9/site-packages/octoprint_ssd1306oleddisplay/helpers.py", line 17, in format_seconds h = int(seconds / 3600) TypeError: unsupported operand type(s) for /: 'NoneType' and 'int' 2024-01-18 23:35:10,614 - octoprint.plugins.tracking - INFO - Sent tracking event print_started, payload: {'origin': 'local', 'file': 'cd3e6b49437a10b606482e8d91bcf69421ead14e'}

Also when i tried to install some libraries, as suggested I also received the following error:
`xxxxxxxx@octoprint:~/oprint $ sudo apt install python3-dev python-smbus i2c-tools python3-pil python3-pip python3-setuptools python3-rpi.gpio
[sudo] password for xxxxxxxxx:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-smbus is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-smbus' has no installation candidate
xxxxxxxxxx@octoprint:~/oprint $`

Environment:
Raspberry Pi 3B+
Octoprint version: 1.9.3.

Any suggestions?

[joesalty]

Problem solved:

Had to add a little code to helpers.py after line nr 17, to solve the problem:

if h is None:
    h = 0

Before:

def format_seconds(seconds):
    h = int(seconds / 3600)
    m = int((seconds - h * 3600) / 60)
    return '{}h {}m'.format(h, m) if h > 0 else '{}m'.format(m)

After:

def format_seconds(seconds):
    h = int(seconds / 3600)
    if h is None:
        h = 0
    m = int((seconds - h * 3600) / 60)
    return '{}h {}m'.format(h, m) if h > 0 else '{}m'.format(m)

This solved my problem.

[fredrikbaberg]

Thank you!
Would you like to make a pull request with the change, or should I add it?