I'm having what seems to be a known issue, but all the recommended troubleshooting steps have failed. I'm running a very simple flow (which worked fine 2 weeks ago), which basically sends an input via Serial node to my Arduino. However, I get the following error:
10 Mar 10:23:40 - [error] [serialconfig:3981ce82553fb55b] serial port COM6 error: Error: Opening COM6: Access denied
I've done the following:
Restarted PC and launched Node-Red.
Made sure neither the Arduino IDE nor the Arduino Serial Monitor is open before launching Node-Red.
My understanding is that if the COM port was being used by something other than the Arduino while compiling and uploading a sketch, that upload should not have been possible, as Arduino would have returned the same message of the access being denied. I read some posts about permissions, but I'm running this as an admin on Windows 10.
I'm at a loss. Here's my Arduino sketch and Node-Red flow if it helps.
I still have no idea what the issue is honestly. I found a workaround though. I forced the Arduino to change to COM 2, and connected Node Red to COM 2. My functions work, but COM 6 I assume is still blocked up. No idea why though. I would like to keep this thread open for a possible fix.