Have been having a connection issue with our ROV today also. It has been connecting and functioning fine up until today. There is no new equipment differences since the last time we used it.
I have tried rebooting the topside, the ROV, and QGC several times.
I switched out the FXTI USB cable.
I switched batteries in case it was a low battery fault.
I reinstalled QGC. Can’t reinstall firmware because I can’t connect to the ROV. Can I plug directly into the ethernet boards with my laptop?
I opened the pressure vessel and ensured that all connections were still good and there wasn’t anything burned up looking.
Pixhawk LEDs are as follows:
FMU PWR=solid green
IO PWR=solid green
Main LED=flashing blue
On start up it makes the usual beeps, the lumen lights flash, etc.
Also, on start up IO B/E is solid orange.
My FXTI has green Power and Link Active lights.
The Fathom X Tether Interface board on the ROV has solid green PWR and Link lights. The ethernet port on this board has flashing orange and green lights.
The board under the Pixhawk with the other ethernet port has one solid orange and one flashing green light. It looks like it also has a solid red ACT light and a blinking green PWR light on the board itself.
The voltage regulator boards on either side have solid red LED lights.
The Power Sense Module has a greed LED.