Re: [Owfs-developers] Simultaneous not working

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

I based my code on a mail from Jan 13/3/2020 which said the best way was

$ owwrite /simultaneous/temperature 1
$ sleep 1s
$ owread /uncached/<sensor0id>/latesttemp
$ owread /uncached/<sensor1id>/latesttemp
$ owread /uncached/<sensor2id>/latesttemp

I was thinking that the problem may be with my Python code, but I have 
just tried it with a bash script and writing to simultaneous/temperature 
make no difference.  I have tried it reading latesttemp and also 
temperature.

I am really confused now.

Mick


On 05/08/2020 09:15, Martin Patzak wrote:
> ... actually I checked my current code and I saw, that I do not read 
> /latesttemp, but read from /uncached/id/temperature
> so reading from /uncached does not trigger a new conversion. Only when 
> you read a second time without triggering /simultaneous
> I also saw that I increased the wait after issuing /simulataneous 
> command to 2 seconds, so I must have had issues at the time...
>
>
> On 05.08.20 09:23, Martin Patzak wrote:
>> Hi Mick,
>>
>> by reading the /uncached value, you are causing a new conversion.
>> Read only /latesttemp and it should work fine.
>>
>> here is my test program, when I first tested simultaneous and pyownet:
>>
>>> import time
>>> from pyownet import protocol
>>>
>>> op = protocol.proxy("razmaban",port=4304)
>>> error = 0
>>> error_old = None
>>>
>>>
>>> while True:
>>>
>>>     op.write('/simultaneous/temperature', '1')
>>>
>>>     time.sleep(1)   # give the sensors time to convert their temps
>>>
>>>     print '...'
>>>
>>>     sensed = op.read('/28.676A20060000/latesttemp')
>>>     print sensed
>>>
>>>     sensed = op.read('/28.DD5915020000/latesttemp')
>>>     print sensed
>>
>>
>> Marty
>>
>> On 05.08.20 00:39, Mick Sulley wrote:
>>> Running v3.2p3 on Raspberry Pi,  I have set up some DS18B20 sensors 
>>> on a test system, all of them are powered, but simultaneous does not 
>>> seem to be working
>>>
>>> The code is below, when I run it the first loop takes 16 seconds 
>>> then it loops at 3 seconds for a while, then a 16 second etc. so it 
>>> looks like it does slow individual conversions, then uses cached 
>>> values until they expire, then another slow individual conversion, 
>>> etc.  Have I got something wrong here?
>>>
>>> Thanks
>>>
>>> Mick
>>>
>>> #!/usr/bin/python3
>>>
>>> # sensor_read.py
>>>
>>> import pyownet
>>> import time
>>>
>>> def main():
>>>     owp = pyownet.protocol.proxy()
>>>     while True:
>>>         start = time.time()
>>>         owp.write('/simultaneous/temperature', b'1')
>>>         time.sleep(1)
>>>         print('start of sensor_read.py')
>>>         sen_lst = ['Solar_Pnl_1A', 'Solar_Pnl_2A','Solar_Pnl_1B', 
>>> 'Pool_Sol_X', 'Pool_CH_X', 'DHW_Mid_Top', 'DHW_Mid_Btm', 
>>> 'DHW_Top','Temp5', 'Temp19', 'Temp20','Temp21', 'Temp22', 'Temp23', 
>>> 'Temp25', 'Temp26', 'Temp27', 'Temp29',  'Temp30']
>>>         prop_lst =  ['/type', '/power', '/latesttemp']
>>>         for p in prop_lst:
>>>             print('%s  ' %p,  end = '')
>>>         print('')
>>>         for sen in sen_lst:
>>>             print('\n%s ' %sen, end = '')
>>>             for prop in prop_lst:
>>>                 try:
>>>                     print('%s  ' %(owp.read('/uncached/' + sen + 
>>> prop).decode()),  end = '')
>>>                 except:
>>>                     print('failed! ',    end = '')
>>>         endt = time.time() - start
>>>         print('\nTime = %f' %endt)
>>>
>>> if __name__ == "__main__":
>>>     main()
>>>
>>>
>>>
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>>
>>
>>
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