(newbie issue) Serialport Error on Starting node-red

[James Barrett]

Getting this error when starting node-red on my Raspberry Pi 3 Model B:

[error] serial port /dev/ttyACM0 error: Error: Error Resource temporarily unavailable Cannot lock port

The serialport node wont connect to the port of my Arduino without manually unplugging and plugging the serial cable. I've tried as much as I know such as updates, re-installs, disabling the serial ports for login.

Node-RED version: v0.16.2

Node.js  version: v6.10.3

Bear with me because I'm new to this stuff. Would appreciate any help. Thank you.

[Dave C-J]

Odd, usually the Pi user has access - but you need to make sure the user you are using is part of the dialout group

eg

    sudo usermod -a -G dialout {your user id}

[Julian Knight]

Sounds like something is grabbing the port before you start Node-RED. Are you running NR as a service or manually?

[James Barrett]

I tried adding my user to the dialout group and the issue still persists.

I am running node-red at start up automatically as a service. When I manually start and stop the service, I sometimes but not always get this error:

[info] [nodebot:39226820.093828] error loading io class

I'm thinking the error with the serial port was introduced because my node-red has problems doing a full deploy when the serial port is connected. It often would cause the server to crash or maybe even the Pi?

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James R. Barrett

Undergraduate Engineer (Mechatronics)

University of Wollongong

Phone: 0437 934 563

Email: jamesbar...@gmail.com | jb...@uowmail.edu

[Mark Setrem]

so are you trying to run the serial port node and the node-red-contrib-gpio/johnny5/raspi-io nodes on the same device?

[James Barrett]

No just a single serialport node connected to my UNO running my own code.

On Thu, May 25, 2017 at 8:51 AM, Mark Setrem <mse...@gmail.com> wrote:

so are you trying to run the serial port node and the node-red-contrib-gpio/johnny5/raspi-io nodes on the same device?

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[Julian Knight]

Strange, I've not had any issues with a directly connected Nano clone running along side an SRF connected (wireless serial) UNO on my Pi. Though I have used udev to fix the names.

On Wednesday, 24 May 2017 23:53:15 UTC+1, James Barrett wrote:

No just a single serialport node connected to my UNO running my own code.

On Thu, May 25, 2017 at 8:51 AM, Mark Setrem <mse...@gmail.com> wrote:

so are you trying to run the serial port node and the node-red-contrib-gpio/johnny5/raspi-io nodes on the same device?

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