Are you sure the cable isn't snagging on something ?

IMO Its sounds like a cable or power spike/drop off or adapter problem nothing to do with Linux OS - as you say you have been using it fine for several hours and over a year ok.

Hi and thanks for the encouragement.
Yeah. The hub checks out ok. Alas I have no spare usb extension cable (hub to laptop).
Here's hoping it's that;)
Cheers

I agree with stash check the power cable to the mount, I had issues like this a while back & it was the power supply to the mount at the connector that was the issue, there are many people that have changed the power connector including me, for a more reliable plug / socket connector at the mount end. A dead giveaway is the power LED whatcha that while slewing & moving the mount for a slight flicker as the indication as to the connector condition.

Regards

Alan

I agree with checking for issues with power to the mount. But also try connecting the mount to the computer without a hub in between. I have found on my HEQ5 it was not very happy going through a (powered) hub, while direct to the my Pi was stable.

Hi everyone and thanks for all the suggestions.

I traced it to the hub, but not what you'd expect. I removed the power from the hub and it now works reliably every time. Not seen that posted before so I hope others may benefit.

I've a DSLR, a zwo guide camera and an eq6.

Cheers,
Steve

That’s strange because I’ve just had a problem with my Raspberry Pi 4 not seeing my ASI 120 MM-S and removing the power supply to the hub fixed that. It works faultlessly on my Raspberry Pi 3 B+ setup

Regards

Alan

Happy my tip helped. It's possible it could be a ground loop issue causing instabilities with the powered hub.

Is the loop thing where you connect the mount to a copper pipe hammered into wet ground?

No it’s the ground line or 0 volt rail of all the equipment connected together , so the signals for the communication between the equipment can pass from one unit to the next. When the hub is powered via the same supply as the raspberry pi to its own separate power supply input, the noise on the supply line can loop around the common connection amplifying the noise even more until it interferes with the signals. A good example of this are the old fashioned HiFi systems which would produce a loud back ground hum which was difficult to remove. Or a PA system squealing with feedback as an extreme example.

Hi,

I am connecting to my eq5 (AZ-EQ5) mount via Shoestring Bluetooth Adapter (BT2EQ5) for two years, now I cannot get the mount connected:

EQMod Mount : "[ERROR] Failed to connect to port (/dev/rfcomm0). Error: Port failure Error: No such file or directory. Check if device is connected to this port.

Compared to last time when it was working, I was running the regular updates, including KStars / INDI drivers.

I have attached the log file.

Would be great if anyone has an idea how to resolve / get back on track!

Best, Helge

I was using my bluetooth adapter just last night without issue on an up to date system. So we could eliminate software bugs.
Ensure modemmanager is not installed on your system, and I like to put this into /etc/rc.local to bind it at startup. (XXs replaced with mac address of mount adapter)

Thanks for your recommendation. I double-checked the configuration - and it turned out the bind command was missing! No idea how it happened, but at the end, easy to resolve.

btw : I do the binding upon start via modification of the bluetooth.service file

(I still follow the procedure once shared by "tseckler" for the shoestring bluetooth adapter.)