How to Manage Serial Port Connections During Terminal Sleep Mode: Difference between revisions

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When the temrinal enter the sleep mode, it will disconnect the power of the usb, which will make the connection broken.
== Issue Overview: ==
 
In scenarios where the terminal enters sleep mode, the power to the USB is disconnected. This disruption leads to the breaking of existing connections and renders the serial port functions inoperative, even after the terminal wakes up from sleep mode.
At that time, any serial port function can not work, even after the terminal restore from sleep mode, wake up.
== Recommended Approach: ==
 
# Proactive Management of Serial Port:
So the serial port should be closed before enter sleep mode. Then open the serial port any time after wakeup, the serial port should work fine.  
#* It is crucial to close the serial port before the terminal enters sleep mode. This proactive step helps in avoiding connection issues.
 
# Re-establishing Connection After Wake-up:
 
#* After the terminal wakes up from sleep mode, open the serial port again. Doing so should restore the serial port's functionality without any issues.
'''Here is the code about how to monitor the screen on/off:'''
== Code Implementation for Screen On/Off Monitoring: ==
* Handling Screen Off Event:
** Implement code to monitor the screen's on/off status.
** When a 'screen off' event is detected, ensure that the serial port is closed.
== Example Code Snippet: ==
<syntaxhighlight lang="java" line='line'>
<syntaxhighlight lang="java" line='line'>
intentFilter filter = new IntentFilter();
intentFilter filter = new IntentFilter();
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registerReceiver(receiver, filter);
registerReceiver(receiver, filter);
</syntaxhighlight>
</syntaxhighlight>
when receive screen off, close the serial port.
This process is essential to maintain the integrity of the serial port functionality and ensure continuous operation post wake-up.

Revision as of 21:25, 24 December 2023

Issue Overview:

In scenarios where the terminal enters sleep mode, the power to the USB is disconnected. This disruption leads to the breaking of existing connections and renders the serial port functions inoperative, even after the terminal wakes up from sleep mode.

Recommended Approach:

  1. Proactive Management of Serial Port:
    • It is crucial to close the serial port before the terminal enters sleep mode. This proactive step helps in avoiding connection issues.
  2. Re-establishing Connection After Wake-up:
    • After the terminal wakes up from sleep mode, open the serial port again. Doing so should restore the serial port's functionality without any issues.

Code Implementation for Screen On/Off Monitoring:

  • Handling Screen Off Event:
    • Implement code to monitor the screen's on/off status.
    • When a 'screen off' event is detected, ensure that the serial port is closed.

Example Code Snippet:

intentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
registerReceiver(receiver, filter);

This process is essential to maintain the integrity of the serial port functionality and ensure continuous operation post wake-up.

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