On Thursday 21 May 2020 12:11:42 David Wright wrote: > On Thu 21 May 2020 at 08:23:55 (-0400), Gene Heskett wrote: > > Since updating to stretch, udev has been randomly swapping ttyUSB0 > > and ttyUSB1 and sometimes ttyUSB2 around, confusing the hell out of > > heyu, a trs-80-coco3, and occasionally even nut. Nut (apc ups) is > > not on a usb-serial adapter, it just a usb cable but the other 2 are > > on individually unique FTDI adaptors. > > > > What udev persistent file, and where is it, do I edit > > To give you a concrete example, I've attached a set of files that > I use to generate stable mountpoints (USB sticks) and symlinks > (drives) in /media when I insert known sticks or DVD-burners. > > The comments in the first file explain how to find out the relevant > information for writing the others. It looks as if your serial numbers > would be a good choice to concentrate on, just like my burners. > > Note that, because I'm lazy, I treat the LABELs, UUIDs and serial > numbers as unique and distinct from each other, in one mixed namespace > (the filenames in /etc/udev/rules.d/my-mountpoints/). > The mountpoint or link is the contents of the file in that directory. > Thus a 1GB USB that I acquired 2017-04-03 with USGS inscribed on it > is FAT formatted with a "UUID" 2017-0403, and generates a mountpoint > /media/usgs1g. The DVD-burner with the serial number KZ3E2DH0440 > generates a link /media/cdrom3, which makes it easy to distinguish > two identical LG Slim Portables plugged in simultaneously. > > > and chattr +i to > > effect a permanent cure for this apparently random device renaming? > > No. don't do that! > > > And whats the command to restart udev from a clean slate without > > rebooting? > > # udevadm control -R > Yet another way, thats at least 2 different ways. Do I dare run that as root right now? Did, date of /dev/ttyUSB0 updated, heyu works but has to restart the relay before I can query status, everytime, relay once started should drop into the background noise and run till a reboot, not exit between sessions. This might be a separate problem though.
> > These are the ttyUSB ports that need persistent names: > > > > root@coyote:rules.d$ usb-devices|grep -C4 SERIAL > > T: Bus=01 Lev=01 Prnt=01 Port=09 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 > > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > > P: Vendor=0403 ProdID=6001 Rev=04.00 > > S: Manufacturer=FTDI > > S: Product=USB HS SERIAL CONVERTER > > S: SerialNumber=FTDHG45D > > C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=44mA > > I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff > > Driver=ftdi_sio > > > > -- > > T: Bus=01 Lev=02 Prnt=04 Port=02 Cnt=02 Dev#= 7 Spd=12 MxCh= 0 > > D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > > P: Vendor=0403 ProdID=6001 Rev=06.00 > > S: Manufacturer=FTDI > > S: Product=USB FAST SERIAL ADAPTER > > S: SerialNumber=FTOOS09N > > C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA > > I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff > > Driver=ftdi_sio > > Cheers, > David. Stay well David Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
