I am migrating my Node-Red flows from an older 1.x Node-Red that was running in a rPi, to the current version running in a PC with Debian.
I am using RFLink 443Mhz receiver board which is connected over USB.
My flow had a serial-in connected to /dev/ttyUSB0.
In my new setup, it says "not connected". When I got to the wizard, I can see the /dev/ttyUSB0 port in the dropdown when I search.
I think it is connected correctly because I see this:
NodeRedServer:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 1a86:7523 QinHeng Electronics CH340 serial converter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
And this:
NodeRedServer:~$ sudo dmesg | grep tty
[ 0.053967] printk: console [tty0] enabled
[ 0.821566] 00:01: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 0.823223] 0000:00:16.3: ttyS1 at I/O 0xf0a0 (irq = 19, base_baud = 115200) is a 16550A
[ 2.373245] systemd[1]: Created slice system-getty.slice.
[ 2.812173] usb 1-5: ch341-uart converter now attached to ttyUSB0
Is it possible that it works different in Debian as in Raspbian?
and try one of those paths. That way, you wont get caught out if it changes.
Also, did you copy over your .node-red folder to the PC - complete with node_modules folder? Because if you did, it won't work. You need to do cd ~/.node-red && npm rebuild.
No, it is a brand new install. I install Node-Red with the install script, added the nodes manually, and imported my flows one-by-one.
I get an error that this port not exists, if I am trying to use that ID.
"[serialconfig:744e8e141f50c2da] serial port /dev/serial/usb-1a86_USB2.0-Serial-if00-port0 error: Error: Error: No such file or directory, cannot open /dev/serial/usb-1a86_USB2.0-Serial-if00-port0"
So if you are using the usual ttyUSBx devices, the user running Node-RED needs to be a member of the dialout group (assuming your config is the same). But if using the by-id devices, you shouldn't need any special permissions.
Thanks you. Yes it is working now. This is a very good tip. I had 2 USB serial devices in the past and it made me mad whenever they changes places (ttyUSB0 <> ttyUSB1).