What is the correct approach for pyserial reading at cmd output after a significant delay

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<pre>I need to read an AT cmd Response after 60 seconds after the write cmd has been sent is this the correct approach I am following or is there any better alternatives kindly assist

What I have tried:

<pre lang="Python">serial_port = serial.Serial(
            port, baudrate=115200, bytesize=8, timeout=4)
  
  serial_port.write(b"AT+RESET\r\n")
  time.sleep(60)
  response = serial_port.readlines()

Posted 16-Sep-21 1:36am

User 15322818

Updated 16-Sep-21 8:26am

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Richard MacCutchan 16-Sep-21 8:18am

What happens when you run it?

[no name] 16-Sep-21 8:23am

I am able to read the data but its not consistent for example i had done serial_port.inwaiting() to check the pending bytes in one case it was around 1000 & other around 2000 bytes same command same wait time , i am confused why data is getting missed

Richard MacCutchan 16-Sep-21 8:29am

Serial ports can send data in bursts, depending on the sending device, so you need to cater for that situation. You need to set up your reader to continue to receive data until you receive something from the device that tells you there is no more. The port may well pause sending many times, so your reader method needs to keep probing.

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CPallini · Answer 1 · 2021-09-16T08:26:00

Solution 1

You may have a look at one (or more) of the code samples gently provided in the pySerial documentation page: Examples — pySerial 3.4 documentation[^].

Posted 16-Sep-21 8:26am

CPallini