I doubt this has anything to do with V4, but I could be wrong. Check to see which process has the port open:
*lsof /dev/ttyUSB0* I'm betting there's another process holding on to the port. -tk On Wed, Aug 28, 2019 at 4:19 AM steeple ian <[email protected]> wrote: > Tom, > > I am testing WeeWX 4.0.0.a7 with the SDS011 driver. > > I am getting the following error: - > > weewx.service - LSB: weewx weather system > Loaded: loaded (/etc/init.d/weewx; generated) > Active: active (exited) since Wed 2019-08-28 12:07:31 BST; 5s ago > Docs: man:systemd-sysv-generator(8) > Process: 1449 ExecStart=/etc/init.d/weewx start (code=exited, > status=0/SUCCESS) > > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/DEBUG weewx.engine: Debug is > 1 > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/DEBUG weewx.engine: > Initializing engine > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/INFO weewx.engine: Loading > station type SDS011 (user.sds011) > Aug 28 12:07:31 DietPi weewxd[1463]: SDS011: driver version is 0.2 > Aug 28 12:07:31 DietPi weewxd[1463]: SDS011: model is NovaPM > Aug 28 12:07:31 DietPi weewxd[1463]: SDS011: port is /dev/ttyUSB0 > Aug 28 12:07:31 DietPi weewxd[1463]: SDS011: poll interval is 10 > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/ERROR weewx.engine: Import > of driver failed: Port is already open. (<class > 'serial.serialutil.SerialException'>) > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/CRITICAL weewx.engine: > Unable to load driver: Port is already open. > Aug 28 12:07:31 DietPi weewxd[1463]: weewx[1463]/CRITICAL weewx.engine: > **** Exiting... > > > RaspberryPi 3, running DietPi Buster (Debian 10). > > > Nothing else connected to the USB ports. > > > The driver works fine with 3.9.2 > > > Thanks, > > Ian > > -- > You received this message because you are subscribed to the Google Groups > "weewx-development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-development/7e25db58-909c-4ca3-a5bb-0beda4cd2458%40googlegroups.com > <https://groups.google.com/d/msgid/weewx-development/7e25db58-909c-4ca3-a5bb-0beda4cd2458%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "weewx-development" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-development/CAPq0zEAo1Wubb%3DHeU4sKk%2B5ZOMp_YYx6JVsxG3f99xm9aAmb8A%40mail.gmail.com.
