The first step was setting up my pi, i decided to reuse a aging pi1 which caused some issues as i couldn't install things from the standard repo's so it needed a little more tinkering. I documented this as i went so i hope this helps others using it on a pi1 also.
The below shall download a precompiled influxdb setup and install it. It will then add a custom repo to your sources list and install grafana and then start it up and enable it at startup. Lastly it shall install php and the curl library for php and then install the influxdb library for php using composer. Socat is optional but if your using one of my rs485 to wifi devices you shall need it to connect to the serial port over the network, if your using a physical connection you can update the code accordingly with the correct serial port.
sudo dpkg -i influxdb_1.2.0_armhf.deb
echo "deb https://dl.bintray.com/fg2it/deb-rpi-1b jessie main" | sudo tee -a /etc/apt/sources.list.d/grafana.list
sudo apt-get update
sudo apt-get install grafana
sudo /bin/systemctl daemon-reload
sudo /bin/systemctl enable grafana-server
sudo /bin/systemctl start grafana-server
sudo apt-get install socat
sudo apt-get install php5-fpm
sudo apt-get install php5-curl
So you can get to the influxdb web interface you need to first enable it with the below.
sudo nano /etc/influxdb/influxdb.conf
Change enabled = false to enabled = true under the [admin] section.
Next you need to conenct to the wifi serial adaptor so this is done using socat which we installed earlier
sudo socat pty,link=/dev/ttyUSB21,unlink-close=0,raw,echo=0 tcp:WirelessDeviceIPAddress:23&
sudo chmod 777 /dev/ttyUSB21
Once this is done you shall need to launch a web browser and go to
http://IP of your Pi:8083/
from here you can create a db called powerwall, it's self explanatory and very easy. Then create a user called root with password root for the DB, i created it as an admin but that is optional.
Once you have done this you shall need to go to the web interface of the new grafana installation at the following address
http://IP of your Pi:8083
From here you configure the datasource as per below
Once this is done the database and grafana initial configuration is done. You now need to download a few files from github. I use the php library which toggio kindly wrote which made this possible, i'd say easier but possible is a more honest answer.
Place the files into one directory together and run
If it works it should print out the current realtime and statistical information. If you receive a could not connect error then please check that socat is still running correctly, i find it can drop out for. If it's working ok then put it into crontab to run as frequently as required.
Lastly you then need to go back to grafana and start to create some dashboards which is simple and very wyswig. If you want/need an example let me know and i can upload my dashboard.