Hi Karl
Thanks for the Team Viewer session and sorting out those issues.
Some of the Network issue persist (well now isolated to some of the wifi RPIs) and appears to be isolated to wifi connected Stretch Rpis.
The only remaining jessie one is Ethernet connected. The Ethernet connected stretchs are fine and don't loose connection (and have moved some to Ethernet) - but the wifi ones eventually become uncontactable, unpingable, can ssh- but still occ seem to send data. The log then fills up with ping return 512. I can't ssh or ping until restart them
There seems a lot of wifi changes from Jessie to stretch with networks and wpa_supplicant.conf.
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wlan0 IEEE 802.11 ESSID:"GlennDesktop"
Mode:Managed Frequency:2.462 GHz Access Point: 24:A4:3C:11:DA:61
Bit Rate=65 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=38/70 Signal level=-72 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:3 Invalid misc:0 Missed beacon:0
I currently trying adding:
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sudo iwconfig wlan0 power off
To disable Power Management .
But wonder whether this is something up with the PI built in Wifi (which there shouldn't be) - will also try a usb dongle and see if better.
Glenn