How to disconnect serial port for programming?

[Hermann]

Hi guys,

here is the situation:
I have a board based on the Moteino that plugs into the Raspi and talks to node-red over /dev/ttyAMA0.
OTOH I also write the Arduino program on the Raspi itself and upload it over the same /dev/ttyAMA0.
When I do that I get an error: connection in use. Makes sense... So I open node-red editor, disconnect the flow from the serial port, deploy, upload the sketch, reconnect to the serial port, deploy, test/change the sketch, disconnect... You get it!
Is there another way to disconnect the serial port from node-red? E.g. via command line or so...

Hermann

[Dave C-J]

Not really (that I can think of). May be slightly quicker to actually stop Node-RED altogether Ctrl-c and then restart it - so not disconnect and deploy etc...

[Luis Montes]

Might want to try my node-red-contrib-gpio node instead for arduino.  On the node close events I attempt a serialport .end() call.

On Wed, Apr 15, 2015 at 12:36 PM, Dave C-J <dce...@gmail.com> wrote:

Not really (that I can think of). May be slightly quicker to actually stop Node-RED altogether Ctrl-c and then restart it - so not disconnect and deploy etc...

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[Hermann]

Thanks for the answer Dave. I was just thinking maybe there is an easier way to do that. Restarting node-red would take less clicking but much more time...
So I will have to make less mistakes in the Arduino porgramm.. ;-)

[Dave C-J]

Luis, 

the main serialport node also closes the serialport on close... but the only time that happens is when we exit or redeploy - the port is held open while running - so he can't reuse it from outside to download to Arduino without stopping.

[Luis Montes]

Got it, missed the part where he didn't want to redeploy.

And this won't help in this case of using a native serial programmer (direct break, dtr, signaling, etc.), but for mailing list posterity if anyone needs multiple processes to send data to and from a serial port an option could be to use node to bind the serial port and relay bytes via mqtt with https://github.com/monteslu/mqtt-serial or just bind to a simple tcp socket server such as https://gist.github.com/monteslu/b5ad4c46c9b6b78f7aea  both of which transports are supported by node-red-contrib-gpio :)

On Wed, Apr 15, 2015 at 1:03 PM, Dave C-J <dce...@gmail.com> wrote:

Luis, 

the main serialport node also closes the serialport on close... but the only time that happens is when we exit or redeploy - the port is held open while running - so he can't reuse it from outside to download to Arduino without stopping.

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