ChristianTremblay/BAC0

BAC0 - Library depending on BACpypes (Python 3) to build automation script for BACnet applications

Safrone

@Safrone

@JoelBender Would this require specific hardware or is there a script that would enable this. I didn't see any responses to my ipv4 discovery requests so probably will need some talking to the client

Joel Bender

@JoelBender

It looks like you are talking to a device from Delta Controls and since it speaks BACnet/Ethernet, unless it is a very old device, it also speaks BACnet/IPv4. The simplest thing to do would be to configure it with BACnet/IPv4 support turned on, give the new port a BACnet network numbers that don't conflict with other BACnet network numbers in the intranet, and you're good to go.

Safrone

@Safrone

OK, thanks for the help

Safrone

@Safrone

what is the specific format of the date data? e.g.: {'calendarEntry': {'dateRange': {'endDate': [121, 7, 5, 1], 'startDate': [121, 7, 5, 1]}}}

ah, found it:

        _date = Date(
            year=_d.year - 1900, month=_d.month, day=_d.day, day_of_week=_d.isoweekday()
        ).value
        _time = Time(
            hour=_t.hour,
            minute=_t.minute,
            second=_t.second,
            hundredth=int(_t.microsecond / 10000),
        ).value

sujitregal

@sujitregal

I have gateway to which 10 radios are connected. Each radio have to 10 motors. Motor have 2 parameters speed and torque. Now i want to create one object for each radio with it's 10 motors and want to show present value of speed and torque. How can i do that?

Gateway is my bacnet device and for remaining i want to create objects

Christian Tremblay

@ChristianTremblay

What do you want to do ? Create 1 BACnet device that will present 100 motors with 2 points ?

It’s possible to create that using a simple name convention

Motor001_speed
Motor001_torque
[…]
Motor100_speed
Motor100_torque

In your code, the presentValue of each point is updated based on the value for from your radio gateway.

The points could be analogInputs (read only from BACnet)

You could also use another name convention for objects… maybe with the radio ID included…

sujitregal

@sujitregal

@ChristianTremblay Thanks for your reply.

Yes your are correct. I want to create one BACnet device in that I have 10 radios.

And radio have connected to some motors.

But my requirement is to create single object for them in which i will update present value.

sujitregal

@sujitregal

But i don't know how to create an array inside object for each radio's each motor

sujitregal

@sujitregal

My BACnet device structure is something like this.

So i want to create object for each radio in which i can send present value of all 10 motors connected to it.

It will be great if i get sample code

Joel Bender

@JoelBender

I think you are looking for a Group Object, Clause 12.14, which "defines a standardized object whose properties represent a collection of other objects and one or more of their properties." You would still create the 200 Analog Value Objects, the present value of each one is for a specific radio, motor, and speed/torque. Then create a Group Object representing a radio, which will reference the 20 points for the corresponding motor and point (see Clause 12.14.5, List_Of_Group_Members). When a BACnet client reads the Present_Value from your gateway it will get back a list of 20 ReadAccessResult structures all at once.

There is rudimentary support for Group Objects in BACpypes, but only for the client side (reading the properties of the object) and not the server side (that gathers all of the referenced values in the list of group members).

Joel Bender

@JoelBender

I'm not sure how widely supported the Group Object will be for BACnet clients, of course if you are only going to be using your own client then it would be fine and still conformant. An easier and more widely supported option is to let the client decide which objects to read using Read Property Multiple, which has the same effect returning a list of read access results. Assuming BACpypes and then BAC0 better support server-side Group Objects in the future, your existing gateway code can simply add those additional objects without changing any of the other code you need to write to get the value into the present value of the Motor075_speed object.

sujitregal

@sujitregal

Hi, I am trying to change object instance number but it is not working for me

sujitregal

@sujitregal

import BAC0
from BAC0.core.devices.local.models import (
analog_input,
datetime_value,
character_string,
)

new_device = = BAC0.connect(ip='192.168.10.184/16', port=47808, deviceId=124)

_new_objects = analog_value(
instance=0,
name="DA-T",
description="Discharge Air Temp in degC",
presentValue=10,
properties={"units": "degreesCelsius"},
)
_new_objects = analog_value(
instance=1,
name="ZN-T",
description="ZoneTemperature in degC",
presentValue=20,
properties={"units": "degreesCelsius"},
)
_new_objects.add_objects_to_application(new_device)

Kushan Abeyawardhane

@kushan-26

@ChristianTremblay Have you tried plotting binary points in the Influxdb data visualizer? I could not view binary points as a time-series plot because the value is in string format. Only "last" value aggregate function would populate a graph but that does not consider previous data values for a given time interval.

sujitregal

@sujitregal

Can anyone help me with example code on how we can define custom properties .

Thank

Christian Tremblay

@ChristianTremblay

Custom properties of existing devices you need to connect to or custom devices for BAC0 itself running as a device ?

custom being : proprietary objects, right ?

Christian Tremblay

@ChristianTremblay

@kushan-26 : I have not worked a lot yet with boolean and multistate values... I don't have the dashboard in front of me right now, but I worked with (I think) the State Timeline and got a pretty neat result.

Ben Bartling

@bbartling

Odd question is it possible to run a BAC0.lite() app without the debug prints? Is there a switch to turn it off?

2021-12-28 13:13:09,846 - INFO    | Starting BAC0 version 21.02.25 (Lite)
2021-12-28 13:13:09,850 - INFO    | Use BAC0.log_level to adjust verbosity of the app.
2021-12-28 13:13:09,852 - INFO    | Ex. BAC0.log_level('silence') or BAC0.log_level('error')
2021-12-28 13:13:09,854 - INFO    | Starting TaskManager
2021-12-28 13:13:09,909 - INFO    | Using ip : 192.168.0.103
2021-12-28 13:13:09,912 - INFO    | Starting app...
2021-12-28 13:13:09,914 - INFO    | BAC0 started
2021-12-28 13:13:09,916 - INFO    | Registered as Simple BACnet/IP App
2021-12-28 13:13:09,947 - INFO    | Update Local COV Task started

BAC0.log_level('silence')?

That worked : )

Christian Tremblay

@ChristianTremblay

Nice !

Ben Bartling

@bbartling

Hey Christian I noticed your post on SO, I was playing around with trying to make a driver for Node Red for BACnet.
https://stackoverflow.com/questions/70511960/python-shell-node-keep-a-python-script-running/70520584?noredirect=1#:~:text=interesting%20work%20guys%20henry%2C%20%40sandeep.kgp

I have sort of given up on it for the time being its too time consuming trying to learn Node & JavaScript. Just don't have the time! Its very do-able if there were some Node.js guru's out there...., I personally think Node Red could do anything Tridium can do and its free. who needs to spend $5k on a JACE????!

The JavaScript BACnet stacks are not user friendly. Like its easier to make something yourself. They also are not maintained very well or I dont think updated in a few years

Bruno Monteiro

@BrunoSMonteiro_twitter

Hello, I'm struggling with Bacnet so sorry if my question is dumb =).
Is it possible to request 2 bacnet devices from the same server? I'm building an API that will get information from N devices but I'm getting a message saying that the there is already a connection from the IP from my server. When I call my API to 2 different bacnets I got an empty message from the second one I called, it looks like that's no possible to call it, is it correct? There is any other way?

Christian Tremblay

@ChristianTremblay

You need to create 1 BAC0 instance that will use the socket (port 47808) and use this same instance to talk to as many controllers you want.

By doing so, your computer becomes a BACnet device that will interact with the network. A device that could also contain objects… which explains why we don’t differentiate client/server in BACnet. We have devices. Every device can talk or answer

mottajunior

@mottajunior

Hello christian, I'm going through a scenario of multiple connections to bacnet, maybe you can help me

I have an API (python+flask) that receives the device address (bbmAddress) is passed via parameter..
the problem is when this API is called by more than one consumer at the same time, to read the points of a device,
and only the first call works, and the others respond (IP Address provided (xx.x.xx.xx) already used by BAC0.
Check if another software is using port 47808 on this network interface...)

When I try to manage the connections, calling a disconnect, it ends up that one connection influences the other, and it turns out that only 1 of the N requests will return (usually the last one)
I don't know if my scenario seems very specific, or I'm not understanding very well how bacnet behaves, in these scenarios,
and if there is a way to do that, either in the end the solution will be to control who makes the requests to this API (1 at a time) or I don't know how to use the library for this scenario.
any suggestion or idea?

Thanks.

code of endpoint:

Christian Tremblay

@ChristianTremblay

I would keep a BAC0 instance running all the time and use it to query the network.

Eugenius

@eugenius:ggpeti.com

[m]

Hello

Please visit https://vaticancatholic.com to save your soul!

sujitregal

@sujitregal

can someone help me in creating a alert and event service for a bacnet code written using python BAC0 library

Christian Tremblay

@ChristianTremblay

Hi ! This is something I haven’t done yet.

Amirreza Heidari

@AmirrezaHeida13_twitter

Hello
I am connected to the bacnet from another system. I connect to the bacnet using the following script:

bacnet=bac0.connect(ip="10.95.32.212/25")

Then I read and write data to devices in my code. When I am running my code I am getting plenty of warnings. Following I have included some of them. Can you please let me know what is the reason?

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