TUTORIAL: From (PI) Zero to Local Blynk Server:

Blynk Servers Local Blynk Server
30

I do not have a static IP
Question is it possible to run blynk as local server at my home network without having a static IP ?
Of cause I can not connect to my local server if I am outside my network

31

Yes it will all run on your LAN without internet access.

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32

Thank you for your quick response
Shall I skip the step 10- Blynk App from 3G/4G and Create New Account ?
May I use my already existing account ?
What should I do instead ?

33

You can skip step 10 but your new Pi server doesn’t know anything about your accounts on Blynk servers around the world. So you will have to create a new account. You can clone projects from the Blynk server to your local server if you don’t want to create them again.

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34

I am a little confused. may be I am wrong with:
Question#1:
because I do not have an static IP address I entered my local IP address of the raspberry at step 10

Question#2:
must I add some information’s to the following lines ?
And what to add ?

#address to bind to. by default bounded to all interfaces
listen.address=

#by default server uses embedded in jar cert to simplify local server installation.
#WARNNING DO NOT USE THIS CERTIFICATES ON PRODUCTION OR IN WHERE ENVIRNOMENTS REAL SECURITY REQUIRED.
#provide either full path to files either use '.' for specifying current directory. For instance "./myfile.crt"
server.ssl.cert=
server.ssl.key=
server.ssl.key.pass=

#by default System.getProperty("java.io.tmpdir")/blynk used
data.folder=
35

I finally got it to run the server
but there is a warning and I do not know how to proceed with it.

pi@raspberrypi:~/Blynk $ java -jar server-0.26.2.jar -dataFolder /home/pi/Blynk Java HotSpot(TM) Client VM warning: You have loaded library /tmp/libnetty-transport-native-epoll8349522589992915587.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
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36

@Brummer hello. What OS do you have and what java version on your raspberry?

37

I use the debian coming with pi 3

java version “1.8.0_65”
Java™ SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot™ Client VM (build 25.65-b01, mixed mode)

38

Is it 64-bit or 32?

39

oh sorry I do not know how to find this out

40

Please try uname –a or arch

41

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.9.28-v7+ #998 SMP Mon May 15 16:55:39 BST 2017 armv7l GNU/Linux

pi@raspberrypi:~ $ arch
armv7l

42

I have one additional question:
I placed the files to a folder named Blynk
/home/pi/Blynk
If I change the directory to:
cd Blynk
I can start the server and it is running with the error message as posted above.
But
if I added the line to crontab:
@reboot java -jar /home/pi/server-0.26.2.jar -dataFolder /home/pi/Blynk &
The server does not start
What have I to correct ?

43

Is Blynk server working? Or it is stops after warning?

44

the server runs
and I can connect with the App

45

Ok. Thanks. I’ll check when have time.

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46

VM warning: You have loaded library /tmp/libnetty-transport-native-epoll6180147343470801760.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It’s highly recommended that you fix the library with 'execstack -c ', or link it with ‘-z noexecstack’.

Blynk Server 0.26.2 successfully started.
All server output is stored in folder ‘/home/pi/Blynk/logs’ file.

So it runs but I do not know if I can ignore the warning.
And my second question is what I should fix for autostart

47

I also get the “VM Warning” error when starting server 0.26.2 on my Pi 2 (latest updates installed and Java v1.8.0_40).

48

This is not the critical issue. For now you may just ignore it. This will be fixed in next versions.

1 Like
49

Can also report this.
Regards