Get readable data from my Resol KM2

[Mello Lorier]

Hi to all

We have a Solar boiler installed and controlled by a HR Solar ADVANCED controller and a Resol KM2 for communications.

I found out that <IP_OF_YOUR_DEVICE>/current/current_packets.vbus return with a binary file current_packets.vbus.  Is there a way to convert this binary file to humn readable data

Kind regards

McMelloW

[Daniel Wippermann]

Hi McHelloW,

there are several ways to decode the file. It conforms to the "VBus Recording File Format" described here:

http://danielwippermann.github.io/resol-vbus/vbus-recording-file-format.html

If you do not want to implement a file parser and formatter yourself there are several existing solutions. One of them is the formatter example of the resol-vbus.rs library:

https://github.com/danielwippermann/resol-vbus.rs/tree/master/examples/formatter/src

It currently lacks documentation, but the usage is simple enough:

- Make sure you have a recent Rust toolchain installed

- "git clone https://github.com/danielwippermann/resol-vbus.rs"

- "cd resol-vbus.rs/examples/formatter"

- "cargo build --release"

- "target/release/formatter csv <<path to current_packet.vbus file>>"

- "cat Output.csv"

Best regards,

Daniel

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[Mello Lorier]

Hi Daniel,

Thanks for your repely. I am studying on this documentation. It looks quite complicated to implement on a Raspberry Pi.

Is there not a simple command like <IP_OF_YOUR_DEVICE>/dlx/live  or for JSON  <IP_OF_YOUR_DEVICE>/current/current_packets.json

Kinds regards

McMelloW
 
Op donderdag 21 december 2017 17:58:03 UTC+1 schreef Daniel:

[Daniel Wippermann]

Hi McHelloW,

no, those web service endpoints are only supported in the dataloggers DL2 and DL3, but not in the KM2.

Best regards,

Daniel

[Mello Lorier]

Hi Daniel

All I want is getting 4-5 values from my Solar-Boiler into my Raspberry Pi Domoticz system. Google for vbus and resol leads any way or another to your name, So that's why I chase you for some extra information.

That is a pitty there is no JSON support on the KM2.  The data is stored to a SD-card in the Advanced Controller of my Solar Boiler in human readable data.But this not avaiable inside the KM2. I have searched the KM2 via SSH, but could not find anything. This is a bit frustrating, I payed a lot of money for monitoring my Solar Boiler. However the only way to do this is via a third party at vbus.net

The Vbusnet download API document example below does help me much either. (See attached file.)

METHOD 1: Basic Authentication

http://www.vbus.net/api/data/download/OWNERSHIP_ID?QUERY_PARAMETER

Add Basic Authorization header (example see below)

Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==

http://www.vbus.net/api/data/download/5?download=true&start_date=1422745200&end_date=1423004400&output_type=text-csv-crlf

&filter=%7B%22onlyVisible%22:true,%22fields%22:%5B%7B%22id%22:%2201_0010_7E11_0100_000_2_0%22,%22name%22:

%22Collector%22%7D,%7B%22id%22:%2201_0010_7E11_0100_002_2_0%22,%22name%22:%22Storage%22%7D%5D%7D

When using my OwnerShip-Id results in lines with only a timestamp at the beginning and nothing else. No query parameter information at all is included in the API document.

I hope you point me at some more information how I can get it done.

Kind regards

McMelloW

Op maandag 25 december 2017 21:57:27 UTC+1 schreef Daniel:

[Daniel Wippermann]

Hi McHelloW,

regarding the "However the only way to do this is via a third party at vbus.net": yes, that is a design decision. The KM2 was originally designed to not be used stand-alone but always in conjunction with VBus.net. Sorry to hear that you had different expectations.

I cannot comment on the VBus.net API since I do not have any experience using it. If you have questions regarding that API it is best to contact RESOL's tech support staff directly.

As I already mentioned: my go-to solution currently would be a small Rust app for the RPi that downloads the file from the KM2 and outputs JSON into a file. The main problem for me currently is that I have no RPis in reach and hence have no possibility to test such a solution. Perhaps I find one at work tomorrow that I can snatch for a couple of days.

If that works I'll send the resulting executable your way.

Best regards,

Daniel

[Mello Lorier]

Hi Daniel,

All the best wishes for 2018

Thanks very much, your formatter for the KM2 works !!

Op donderdag 21 december 2017 17:58:03 UTC+1 schreef Daniel:

If you do not want to implement a file parser and formatter yourself there are several existing solutions. One of them is the formatter example of the resol-vbus.rs library:

https://github.com/danielwippermann/resol-vbus.rs/tree/master/examples/formatter/src

It currently lacks documentation, but the usage is simple enough:

- Make sure you have a recent Rust toolchain installed

- "git clone https://github.com/danielwippermann/resol-vbus.rs"

- "cd resol-vbus.rs/examples/formatter"

- "cargo build --release"

- "target/release/formatter csv <<path to current_packet.vbus file>>"

- "cat Output.csv"

Best regards,

Daniel

Installing Rust appears to be much easier on a Raspberry Pi after all. Just followed the steps on https://github.com/rust-lang/rust and https://doc.rust-lang.org/book/second-edition/ch01-01-installation.html for a Linux installation. 

After that I followed the steps above which you wrote to me. It all went without any errors and I have an executable formatter on my Pi. After running the formatter, on a fresh downloaded current_packets.vbus, I have a file Output.csv, with the fields tab seperated.

I have a few questions about the formatter

1. Is the formatter independent executable, or do you need other files apart from the input file. Can I put it on any location on my Pi?
2. Can you add a path for the location of the output file?
3. Finally, can you use json as an output file-type?

Thanks again and greetings

McMelloW

[Mello Lorier]

Compiled the formatter again with some alteration

pi:~/resol-vbus.rs/examples/formatter $ cargo build --release

   Compiling formatter v0.1.0 (file:///home/pi/resol-vbus.rs/examples/formatter)

    Finished release [optimized] target(s) in 79.23 secs

pi:~/resol-vbus.rs/examples/formatter/target/release $ formatter csv /tmp/current_packets.vbus

-bash: formatter: command not found

Thisis the current version of rustc and cargo

pi@mcmellow-pi:~ $ rustc -V

rustc 1.23.0 (766bd11c8 2018-01-01)

pi@mcmellow-pi:~ $ cargo -V

cargo 0.24.0 (45043115c 2017-12-05)

Somebody knows a trick to solve this   command not found error

Kind regards

[Daniel Wippermann]

Hi McMelloW,

try "./formatter csv /tmp/current_packets.vbus".

If you do not put the dot-slash combination in front of the formatter command Linux will normally not search in the local directory.

Best regards,

Daniel

[Mello Lorier]

try "./formatter csv /tmp/current_packets.vbus". This works very well on a commandline. without the ./ it returns with: -bash: formatter: command not found

However, in a script  os.execute(' </PATH-of-executable/formatter -- simple-json /tmp/current_packets.vbus') does not work.

I think it something in Debian what I have to change.

McMelloW