In the previous tutorial we saw how to install the local Blynk server on a Raspberry Pi 3. In this tutorial we will install the Blynk server on an Orange Pi Plus 2e running Armbian based on Ubuntu Xenial 16.04LTS. The Orange Pi + 2e is more powerful than the Raspberry Pi 3. It mainly has 2GB of RAM and 16GB of memory eMMC more reliable and faster than SD boards.
Check the installed Java version
Blynk needs Java 8 to work. Armbian 5.24 embeds Java 5, especially version 5.4.0. To check the version of Java installed on your system, run the following command
root@orangepiplus2e:~# java -version java version "1.5.0" gij (GNU libgcj) version 5.4.0 20160609 Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
If you are in this case, you must already update Java. Follow these steps that have been detailed here.
su - echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886 apt-get update apt-get install oracle-java8-installer exit
During the installation, you will have two messages to validate
After the update, version 8 of Java should be installed
root@orangepiplus2e:~# java -version java version "1.8.0_121" Java(TM) SE Runtime Environment (build 1.8.0_121-b13) Java HotSpot(TM) Client VM (build 25.121-b13, mixed mode)
Installing and Configuring the Local Blynk Server
Place yourself in the directory where you want to install Blynk then download the jar file from the server
It’s over !
Configuring the server (server.properties file)
The first configuration file to create is server.properties. Retrieve a basic file from GitHub here. In addition to the destination files of the files, you will be able to modify the communication ports. This is especially important if you have installed a home automation server (or other software) that uses the same ports as the local Blynk server. For example, by default the port http (and web socket) is the 8080. If you use Domoticz, it will get stuck. You can use port 8082 instead.
#hardware mqtt port hardware.mqtt.port=8440 #hardware ssl port hardware.ssl.port=8441 #hardware plain tcp/ip port hardware.default.port=8442 #http and web sockets port http.port=8082 #https and web sockets port https.port=9443 #application ssl port app.ssl.port=8443
Blynk has a management interface accessible from a web browser. By default this interface is accessible only from the computer the raspberry Pi on which the server is installed. If you want to be able to access it from any computer on the local network, change the allowed.administrator.ips parameter at the end of the file like this
Allowed.administrator.ips = 0.0.0.0/0
Save the server.properties file in the same folder as the server.
Configuring the email account (mail.properties file)
The second parameter file to create is the mail.properties file, which allows you to send the Tokens for the Arduino code. Create a new configuration file named mail.properties and save it to the same folder as the server. Here is a sample configuration file for gmail.
mail.smtp.auth=true mail.smtp.starttls.enable=true mail.smtp.host=smtp.gmail.com mail.smtp.port=587 mail.smtp.username=EMAIL mail.smtp.password=PWD
Starting the Server
Start the server manually
To start the server, run the following command
java -jar server-0.23.0.jar -dataFolder /home/pi/Blynk
The path to the data directory (-dataFolder) is passed as a parameter. The server starts in about ten seconds.
Blynk Server successfully started. All server output is stored in current folder in 'logs/blynk.log' file.
To stop, press the CTRL + C key combination.
Start the Blynk server when Armbian starts
To start the server automatically at startup, simply run the start command by adding & at the end of the command. This gives
java -jar server-0.23.0.jar -dataFolder /home/pi/Blynk &
If it does not work, edit the crontab
pi@raspberrypi:~ $ crontab -e no crontab for pi - using an empty one Select an editor. To change later, run 'select-editor'. 1. /bin/ed 2. /bin/nano <---- easiest 3. /usr/bin/vim.tiny Choose 1-3 : 2
Go to the end of the file and add the following command. Do not forget to change the path to match your installation directory.
@reboot java -jar /home/pi/server-0.23.0.jar -dataFolder /home/pi/Blynk &
The Blynk server now works exactly like any other system (Windows, MacOS, Raspberry Pi). Follow the previous tutorial to start using Blynk and assign unlimited energy to your user account.
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