Unfortunately owpython (the swig bindings) is not under active development. The
current best practice is to *always* run owserver on the host with the one-wire
bus master, and have all clients access the one-wire bus via the owserver
protocol.
My personal suggestion is to take the time to try out the recommended setup,
although I’m not sure that this will solve your problem.
- Start from a fresh system (no other owfs components installed) and install
owserver and ow-shell:
$ sudo apt install owserver ow-shell
- Delete the hyper-verbose default debian owfs.conf file and use this minimal
config
server: usb = all
server: port = 4304
- Enable and start the owserver
$ sudo systemctl stop owserver
$ sudo systemctl enable owserver
$ sudo systemctl start owserver
- Confirm that owserver is running:
$ systemclt status owserver
- Test your setup
$ owdir
- Install and test owpython. (Run the python client as an unprivileged user, no
need to run as root.)
$ sudo apt install python-ow
$ python
>>> import ow
>>> ow.init('localhost:4304')
>>> ow.owfs_get('/')
At this point you can continue using the old owpython (as an owserver client,
and not directly controlling the usb bus master), but you are also ready to
switch to more modern alternatives.
Hope this helps
Stefano.
> On 15 Dec 2017, at 21:22, HW <h...@linhow.us> wrote:
>
> Using a DS9490, I have been running the python based Weewx weather station
> software for several years on the Raspbian Wheezy OS. Unfortunately, the same
> program is failing on the new Raspbian Stretch OS and can be verified with a
> simple test case. Run the following program as root (to bypass any permission
> issues) on the Raspbian Stretch November Release:
> #!/usr/bin/python
> import ow
> ow.init('u')
> and the test program exits with the error message:
> File "/usr/lib/python2.7/dist-packages/ow/__init__.py", line 224, in init
> raise exNoController
>
> Syslog shows
> Dec 7 17:33:27 wx kernel: [436943.136563] usb 1-1.5: new full-speed USB
> device number 107 using dwc_otg
> Dec 7 17:33:27 wx kernel: [436943.270174] usb 1-1.5: New USB device found,
> idVendor=04fa, idProduct=2490
> Dec 7 17:33:27 wx kernel: [436943.270189] usb 1-1.5: New USB device strings:
> Mfr=0, Product=0, SerialNumber=0
> Dec 7 17:33:27 wx mtp-probe: checking bus 1, device 107:
> "/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.5"
> Dec 7 17:33:27 wx mtp-probe: bus: 1, device: 107 was not an MTP device
> and after running the above test program:
> Dec 11 07:05:46 wx OWFS[30742]: DEFAULT: owlib.c:(208) Cannot open USB bus
> master
> Dec 11 07:05:46 wx OWFS[30742]: DEFAULT: owlib.c:(52) No valid 1-wire buses
> found
>
> For the above test, after running apt-get update and upgrade, library
> versions were python-ow 3.1p5-1, libow 3.1.5.
>
> A workaround was found by Glenn McKechnie and posted on the weewx-user Google
> group:
> apt-get remove libow-3.1-5 python-ow owfs-common
> Build and install owfs-2.9p8
> The test program now exits normally and syslog shows
> Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_ds9490.c:(250) Unclear what <>
> means in USB specification, will use first adapter.
> Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_usb_msg.c:(292) Opened USB DS9490
> bus master at 1:11.
> Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_usb_cycle.c:(190) Set DS9490 1:11
> unique id to 81 38 0F 31 00 00 00 4E
>
> Unfortunately, I don't have a Debian Stretch system so I can't tell if this a
> Debian or a Raspbian issue.
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