NEED HELP: arduino via serial USB over Raspberry Pi 3

Solved
1

hi. i have problem to connect the arduino to the blynk server via serial USB where im use the raspberry pi 3.
i have try to run ./blynk-ser.sh and i got this error:

pi@raspberrypi:~/Arduino/libraries/Blynk/scripts $ ./blynk-ser.sh
[ Press Ctrl+C to exit ]
/dev/ttyUSB0 not found.
Select serial port [ /dev/ttyACM0 ]: 
Resetting device ...
stty: hupcl: No such file or directory
Connecting: FILE:,raw,echo=0,clocal=1,cs8,nonblock=1,b9600 <-> openssl-connect:blynk-cloud.com:8441,cafile=/home/pi/Arduino/libraries/Blynk/scripts/certs/server.crt,nodelay
2016/10/27 12:33:16 socat[6408] N opening undef "" for reading and writing
2016/10/27 12:33:16 socat[6408] E open("", 04002, 0666): No such file or directory
2016/10/27 12:33:16 socat[6408] N exit(1)
Reconnecting in 3s...
^CExited!

so, any solution with this problem???

2

Figure out which serial device is your Arduino. E.g. lsusb and see where it’s attached, or check the /dev folder for an USB device before and after plugging in your Arduino

3

my arduino mega is on port /dev/ttyACM0

i hv try this just now:
sudo ./blynk-ser.sh -c /dev/ttyACM0 -b 9600 -s cloud.blynk.cc -p 8442

but its stuck at opening connection … 5 minute later still stuck at there

pi@raspberrypi:~/Arduino/libraries/Blynk/scripts $ sudo ./blynk-ser.sh -c /dev/ttyACM0 -b 9600 -s cloud.blynk.cc -p 8442
[ Press Ctrl+C to exit ]
Resetting device /dev/ttyACM0...
Connecting: FILE:/dev/ttyACM0,raw,echo=0,clocal=1,cs8,nonblock=1,b9600 <-> openssl-connect:cloud.blynk.cc:8442,cafile=/home/pi/Arduino/libraries/Blynk/scripts/certs/server.crt,nodelay
2016/10/27 12:41:31 socat[6675] N opening character device "/dev/ttyACM0" for reading and writing
2016/10/27 12:41:32 socat[6675] N opening connection to AF=2 45.55.195.102:8442
4

@alexanderisz not sure where you are getting your information from but it is out of date.

https://github.com/blynkkk/blynk-library/wiki/USB-Serial shows the existing server not the server that was retired over 6 months ago.

sudo ./blynk-ser.sh -c /dev/ttyACM0 -b 9600 -s blynk-cloud.com -p 8442

5

thanks for that information…

so, i hv try this and its always reconnecting… any solution?

pi@raspberrypi:~/Arduino/libraries/Blynk/scripts $ ./blynk-ser.sh -c /dev/ttyACM0 -b 9600 -s blynk-cloud.com -p 8442
[ Press Ctrl+C to exit ]
Resetting device /dev/ttyACM0...
Connecting: FILE:/dev/ttyACM0,raw,echo=0,clocal=1,cs8,nonblock=1,b9600 <-> openssl-connect:blynk-cloud.com:8442,cafile=/home/pi/Arduino/libraries/Blynk/scripts/certs/server.crt,nodelay
2016/10/27 12:50:41 socat[6820] N opening character device "/dev/ttyACM0" for reading and writing
2016/10/27 12:50:42 socat[6820] N opening connection to AF=2 188.166.177.186:8442
2016/10/27 12:50:42 socat[6820] N successfully connected from local address AF=2 192.168.1.6:45160
2016/10/27 12:50:43 socat[6820] E SSL_connect(): socket closed by peer
2016/10/27 12:50:43 socat[6820] N exit(1)
Reconnecting in 3s...
6

Did you put in the correct auth token?

7

yes… ihv put correct token.

8

You probably need to use TCP instead of SSL, to see if the problem is in there. Edit the blynk-ser.sh file and change:

TO_TYPE="SSL" # TCP, SSL

to:

TO_TYPE="TCP" # TCP, SSL

And see what happens then

9

okay. i hv change SSL to TCP on blynk-ser.sh file. and was successfully connected. but on my blynk app said “your Arduino not in network”.

pi@raspberrypi:~/Arduino/libraries/Blynk/scripts $ ./blynk-ser.sh
[ Press Ctrl+C to exit ]
/dev/ttyUSB0 not found.
Select serial port [ /dev/ttyACM0 ]: /dev/ttyACM0
Resetting device /dev/ttyACM0...
Warning: Server connection may be insecure!
Connecting: FILE:/dev/ttyACM0,raw,echo=0,clocal=1,cs8,nonblock=1,b9600 <-> TCP:blynk-cloud.com:8442,nodelay
2016/10/27 13:14:54 socat[8228] N opening character device "/dev/ttyACM0" for reading and writing
2016/10/27 13:14:55 socat[8228] N opening connection to AF=2 188.166.177.186:8442
2016/10/27 13:14:55 socat[8228] N successfully connected from local address AF=2 192.168.1.6:45208
2016/10/27 13:14:55 socat[8228] N starting data transfer loop with FDs [5,5] and [6,6]
10

Yeah, ignore it and see if you can light a LED or switch a relay attached to a physical pin :slight_smile:

-edit

To have SSL work, you need to install the server.crt from the cloud server.

11

i hv attached the LED on digital pin 13 and try to control via blynk app… unfortunately the LED not responding

12

Hmm, bugger, I’ve got a feeling we are almost there. What sketch did you upload to the Arduino?

13

i use Arduino serial USB example…

14

And all you did was enter the Auth token? If you did it should be fine and working.

15

yaaa i hv enter the auth token… but didt not working… i will try it again.

16

finally is working !! thanks @Lichtsignaal for your helping. hv a nice day.

17

Yr welcome and enjoy :slight_smile:

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