The Internet Of Things

Connect SAJ Solar Inverter to Node-Red (part 4)

Node-Red flow part 3

Node 14:

Out of order cath node

Node 15:

Out of order function node

Node 16:

Convert Date & Time function node

Node 17:

Display Date text node

Node 18:

Display Time text node

Connect SAJ Solar Inverter to Node-Red (part 3)

Node-Red flow part 2

Node 7:

Display Day power text node

Node 8:

Display Day power gauge node

Node 9:

Display State text node

Node 10:

Display Power text node

Node 11:

Display Power gauge node

Node 12:

Display Power chart node

Node 13:

Display Max Power text node

Connect SAJ Solar Inverter to Node-Red (part 2)

Node-Red flow part 1

Node 1:

Inject every second a Timestamp

Node 2:

Connect to http://192.168.1.24/real_time_data.xml

Node 3:

Convert XML to a Javascript Object

Node 4:

Convert the Javascript Object to individual Objects

Node 5:

Convert the Onjects

Node 6:

Select the objects

Connect SAJ Solar Inverter to Node-Red (part 1)

My SAJ Solar Inverter:

Model: Sununo Plus 4K-M:

http://www.saj-solar.com/

SAJ Solar Inverter local webpage:

http://192.168.1.24

SAJ Solar Inverter local data:

http://192.168.1.24/real_time_data.xml

Node-Red program:

Node-Red screenshot:

https://192.168.1.31:1880/ui

Node-Red Security

Stop Node-Red

sudo systemctl disable nodered.service
node-red-stop
sudo reboot & exit

Generating new SSH keys

cd .node-red (cd /home/pi/.node-red or cd ~/.node-red)
openssl genrsa -out privatekey.pem 1024
openssl req -new -key privatekey.pem -out private-csr.pem
openssl x509 -req -days 365 -in private-csr.pem -signkey privatekey.pem -out certificate.pem
ls -all and you find 3 new files:

certificate.pem
private-csr.pem
privatekey.pem

Update settings.js

nano settings.js
uncomment lines:

var fs=required("fs");
https: {
key: fs.readFileSunc('/home/pi/.node-red/privatekey.pem')
cert: fs.readFileSunc('/home/pi/.node-red/certificate.pem')
},
adminAuth: {
type: "credentials",
users: [{
Username: "admin",
password: " --- ",
permissions: "*"
}]
},

save & exit settings.js

Install node-red-admin

su (to log as root)
npm install -g node-red-admin
exit
pwd
cd .node-red
node-red-admin hash-pw

Enter the password you want, copy the hash code and save this to the 'password' line in the settings.js file.

Start Node-red

sudo systemctl enable nodered.service
node-red-start

Now you cane see Node-red in your browser by using https://'ip adres raspberry pi':1880
and login with admin and your password.

Update Node-Red on the Raspberry Pi

Update Raspberry Strecht Lite to the latest version.

sudo rpi-update
sudo reboot & exit (reboot the Raspberry Pi)
sudo apt-get -y update
sudo apt-get -y upgrade
sudo apt-get dist-upgrade
sudo reboot & exit (reboot the Raspberry Pi)

Install the latest Node.js and Npm

bash <(curl -sL https://raw.githubusercontent.com/node-red/raspbian-deb-package/master/resources/update-nodejs-and-nodered)

To find the version type this commands:

node -v
v8.9.3

npm -v
5.5.1

Install n

sudo npm install -g n
sudo n latest
sudo npm install -g npm@latest
sudo reboot & exit (reboot the Raspberry Pi)

To find the version type this commands:
node -v
v9.3.0
npm -v
5.6.0

Start and Stop Node-Red

node-red-stop - to stop Node-red
node-red-start - to start Node-Red
node-red-log - to view the recent log output
sudo systemctl enable nodered.service - to autostart Node-Red at every boot
sudo systemctl disable nodered.service - to disable autostart on boot

Fix the Serialport Error

cd .node-red
node-red-stop
sudo npm rebuild
de-red-start (ctrl c to exit Node-red)

Start Node-Red as a service

sudo systemctl enable nodered.service
node-red-start (ctrl c to exit Node-red)

Now you cane see Node-red in your browser by using http://'ip adres raspberry pi':1880

https://youtu.be/B0hpv_8is0Q

MQTT

MQTT is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. For example, it has been used in sensors communicating to a broker via satellite link, over occasional dial-up connections with healthcare providers, and in a range of home automation and small device scenarios. It is also ideal for mobile applications because of its small size, low power usage, minimised data packets, and efficient distribution of information to one or many receivers.

MQTT

What do you need?

Raspberry Pi
Power supply 5V 2A
SD Card with Raspbian Strech Lite link
UTP Cable
Case for the Raspberry Pi
PuTTy on a Windows or Linux computer.

Setup Raspbian Stretch Lite

Installation of the MQTT Broker on Raspberry Pi. http://mqtt.org/
Make a SSH connection with PuTTy:
Login: 'pi'
Password: 'raspberry'
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install mosquitto
sudo apt-get install mosquitto-clients
Testing the Working of MQTT
Open two putty programs on windows, you can do this by clicking the putty.exe file and enter the host name and click to open do this twice so that two putty programs access Pi via ssh. Lets say putty1 and putty2 are open and connected to Pi via ssh for our convenient.
In putty1 window type the command with the topic name YouTube test this topic name can be anything, according to the convenience of the user .

mosquitto_sub –d –t YouTube test
In putty2 image 2 window type the following command with the same topic i.e YouTube test

mosquitto_pub –d –t YouTube test –m “Hello from Yuotube”
Now come to the window putty1, image 1 here you will be able to see the message

Hello from Yuotube

https://youtu.be/hhcc9Pt03x8