Re: [Owfs-developers] Writing to DS2413 Device with Python 3

[Mick S. <mi...@su...>]

Yes I have struggled with that as well.  I have discovered how to do it, 
but I don't really understand why.

The answer seems to be that to write a 1 you need

     owproxy.write('device_id' + '/PIO.BYTE, b'1')

so you need to write the byte value of the string 1, not the byte value 
of the integer 1.  As I say, I don't understand why that is so, I dabble 
with Python, I'm far from expert :)

Hope that helps

Mick

On 27/08/2020 15:18, Dennis Putnam wrote:
> Hi Martin,
>
> See embedded comments.
>
> On 8/27/2020 2:56 AM, Martin Patzak wrote:
>>
>> what does *onOff.to_bytes(1,byteorder=sys.byteorder)) *evaluate to? 
>> Is that resulting in a byte-value? I am not familiar with this...
> This seems to be the crux of the problem. After a lot of testing it 
> appears to be a python 3 issue converting an integer to a byte string. 
> I am convinced that passing a byte string to the write function is the 
> problem. Thanks for everyone's help but this is not an owfs problem.
>>
>> Things you could try:
>>
>>   * In the path use the fully qualifying path and add */uncached *and
>>     write a byte-value like this
>>     *owproxy.write('/uncached/3A.0BE14D000000/PIO.BYTE',b'0')*
>>   * writeto the individual outputs PIO.A or PIO.B directly
>>   * try reading the sensed values***print('sensed.BYTE = ',
>>     owp.read('/uncached/****3A.0BE14D000000**/sensed.BYTE')*
>>
>> **
>> On 26.08.20 21:05, Dennis Putnam wrote:
>>> I have rewritten my code to use pyownet but am now nearly back where 
>>> I started. I have the following code:
>>>
>>> *owproxy.write('/3A.'+blower.id_+'/PIO.BYTE',onOff.to_bytes(1,byteorder=sys.byteorder))
>>>
>>> *That statement gives me the following error:
>>>
>>> *pyownet.protocol.OwnetError: [Errno 22] legacy - Invalid 
>>> transaction: '/3A.0BE14D000000/PIO.BYTE'
>>>
>>> *The error is meaningless to me. The path is not wrong so is it 
>>> complaining about writing a single byte?
>>>
>>> Thanks again.
>>>
>>> On 8/24/2020 4:33 PM, Dennis Putnam wrote:
>>>> Thanks to everyone that replied. I was not aware of pyownet. I will 
>>>> look into that and rewrite my code to use it.
>>>>
>>>> On 8/24/2020 11:47 AM, Martin Patzak wrote:
>>>>> For python I would highly recommend you use the library *pyownet 
>>>>> *by Stefano Miccoli
>>>>> /https://github.com/miccoli/pyownet/
>>>>>
>>>>> /using Fuse can lead to weird problems... (not saying that it is 
>>>>> the reason in your specific case)
>>>>>
>>>>> or you can use the buil-in functions in owserver 
>>>>> owread/owwrite/owdir instead.
>>>>>
>>>>
>>>
>>>
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