> On Jan 11, 2018, at 11:36 AM, Dennis Lee Bieber <[email protected]> wrote:
>
> On Thu, 11 Jan 2018 15:12:33 +0000, "Schoeni, Yann"
> <[email protected]> declaimed the following:
>
>> I've a web application which needs to send data to a serial port. The
>> webserver uses ajax to send data to a python script.
>>
>> The Python script uses the serial module to open, send data, and close the
>> serial port.
>>
>> Is there a way to keep the serial port open ?
>>
>> Because for now, I open/close it between each transaction and I need to be
>> 100% sure the data package will be send .. which is not the case with my
>> actual python script.
I'd add one observation: while you can be reasonably sure that data is sent if
you ask the serial port to send it, that does NOT mean it will be received. I
suspect what is actually needed is a guarantee that the data is received.
A serial port does not offer that guarantee. If the hardware is clean, it only
offers a high probability. If you want guarantees, you need a data checking
and acknowledgement protocol, like DDCMP or TCP or DECnet.
paul
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