digimat.bac0 0.0.38

Digimat BACnet BAC0 Wrapper

This is a Python 3 module basically providing a wrapper around the [BAC0] (https://bac0.readthedocs.io/en/latest/) module, itself using [bacpypes] (https://github.com/JoelBender/bacpypes), allowing to access and browse BACnet/IP networks. The main goal of this module id to provide a simple way to discover/browse/interact with BACnet/IP devices on a network. Install this module with a pip install -U digimat.bac0 command.

>>> from digimat.bac0 import BAC
>>> bacnet=BAC(network='192.168.0.84/24')

Congratulations ! You just have launched a BACnet/IP node binded to your LAN card (ip 192.168.0.84, netmask 255.255.255.0). The underlying BAC0 module has started a thread managing the remote bacnet nodes (understand remote “BACnet servers”) you will declare to your node. You have to provide the ip (“ip/networkSize”) that will be used to send/receive every BACnet UDP messages. Under Linux/MacOS hots, this can be done automagically if you have installed the [netifaces] (https://pypi.org/project/netifaces/) module. If so, you can ommit the network parameter

>>> bacnet=BAC() # return a BAC object
>>> bacnet
<BAC:192.168.0.84/24(0 devices)>

If needed, you can give a bbmd router (‘ipAddress[:port]’) to the constructor

>>> bacnet=BAC(router='192.168.2.1')

Now, assuming that your network settings are correct, you can start discovering the network

 >>> bacnet.whois()      # return a list of devices detected on the network
[('192.168.0.15', 8015), ('192.168.0.80', 4000)]

The whois() method returns a list of remote BACnet/IP servers detected on the network (ip/deviceId). TYou can then can add to your node thoses remote devices (BACnet servers)

>>> device=bacnet.declareDevice(8015, '192.168.0.15')

In fact, if the device is detected by the whois(), you can declare a node based on it’s id or it’s ip address

>>> device=bacnet.declareDevice(8015) # return a BACDevice object
>>> device=bacnet.declareDevice('192.168.0.15') # equivalent
>>> device
<BACDevice:8015#0(Digimat:Digimat3_CPU_Bridge, operational, 66 points)>

>>> bacnet.discover() # this will magically declare ebery whois() device

Every BAC* object has a .dump() method, very useful in interactive sessions

>>> bacnet.dump()
+---+---------+------+--------------+---------+---------------------+-------------+-------------+---------+
| # | name    |  id  |      ip      | vendor  | model               |    status   | description | #points |
+---+---------+------+--------------+---------+---------------------+-------------+-------------+---------+
| 0 | s_112_1 | 8015 | 192.168.0.15 | Digimat | Digimat3_CPU_Bridge | operational | S+T         |    66   |
+---+---------+------+--------------+---------+---------------------+-------------+-------------+---------+

>>> device.dump()
+-----------------------+--------------+
| property              | value        |
+-----------------------+--------------+
| ip                    | 192.168.0.15 |
| id                    | 8015         |
| name                  | s_112_1      |
| description           | S+T          |
| systemStatus          | operational  |
| vendorName            | Digimat      |
| vendorIdentifier      | 892          |
| points                | 66           |
| segmentationSupported | True         |
| analogInput           | 16           |
| analogOutput          | 8            |
| binaryInput           | 31           |
| binaryOutput          | 11           |
+-----------------------+--------------+

Once a device has been declared, you can retrieve it with bacnet.device(…) or directly with a bacnet[…] request. You can use either the index (0), the name (s_112_1), the id (8105) or the ip (192.168.0.15) to retrieve your device from the BAC object. If you redeclare a device already existing, it will be simply returned (not duplicated).

You will have to dig a bit into the BAC and BACDevice objects to find avalaible methods and properties. It’s now time to access to the points (variables) of our device, all provided by the device.points property, returning a BACPoints object

>>> points=device.points
>>> points
<BACPoints(66 points)>

>>> points.dump()
+----+----------------------+---------------------+-------------------------------------------------------------------------+--------------+---------+----------+------+-------+-------+------+
| #  | class                | name                | description                                                             | type         | address |    value | unit |  COV  |  OoS  | PRI  |
+----+----------------------+---------------------+-------------------------------------------------------------------------+--------------+---------+----------+------+-------+-------+------+
| 0  | BACPointAnalogInput  | r_112_1_cio_13056_0 | sonde exterieure                                                        | analogInput  |   13056 |    38.51 | C    | False | False | None |
| 1  | BACPointAnalogInput  | r_112_1_cio_13057_0 | sonde depart chaudiere                                                  | analogInput  |   13057 |    26.07 | C    | False | False | None |
| 2  | BACPointAnalogInput  | r_112_1_cio_13058_0 | sonde depart radiateurs                                                 | analogInput  |   13058 |    31.20 | C    | False | False | None |
| 3  | BACPointAnalogInput  | r_112_1_cio_13059_0 | sonde depart chauffage de sol                                           | analogInput  |   13059 |    27.10 | C    | False | False | None |
| 4  | BACPointAnalogInput  | r_112_1_cio_13060_0 | pot.physique consigne depart chauffage de sol (-10;+10C)                | analogInput  |   13060 |     4.91 | C    | False | False | None |
| 5  | BACPointAnalogInput  | r_112_1_cio_13061_0 | pot.physique consigne depart radiateurs (-10;+10C)                      | analogInput  |   13061 |     2.93 | C    | False | False | None |
| 6  | BACPointAnalogInput  | r_112_1_cio_13062_0 | sonde ambiance bureau direction rez                                     | analogInput  |   13062 |    26.26 | C    | False | False | None |
| 7  | BACPointAnalogInput  | r_112_1_cio_13063_0 | pot.temperature bureau direction rez                                    | analogInput  |   13063 |    21.56 | C    | False | False | None |
| 8  | BACPointAnalogInput  | r_112_1_cio_13064_0 | sonde ambiance bureau direction cote hall rez                           | analogInput  |   13064 |    26.40 | C    | False | False | None |
| 9  | BACPointAnalogInput  | r_112_1_cio_13065_0 | pot.temperature bureau direction cote hall rez                          | analogInput  |   13065 |    21.71 | C    | False | False | None |
| 10 | BACPointAnalogInput  | r_112_1_cio_13066_0 | sonde ambiance salle de conferences                                     | analogInput  |   13066 |    27.81 | C    | False | False | None |
| 11 | BACPointAnalogInput  | r_112_1_cio_13067_0 | sonde ambiance temperature bureau comptabilite  rez                     | analogInput  |   13067 |    25.85 | C    | False | False | None |
| 12 | BACPointAnalogInput  | r_112_1_cio_13068_0 | sonde ambiance bureau schematique s-sol                                 | analogInput  |   13068 |    24.23 | C    | False | False | None |
| 13 | BACPointAnalogInput  | r_112_1_cio_13069_0 | pot.temperature bureau schematique s-sol                                | analogInput  |   13069 |    21.00 | C    | False | False | None |
| 14 | BACPointAnalogInput  | r_112_1_cio_13070_0 | sonde ambiance bureau individuel s-sol                                  | analogInput  |   13070 |    25.86 | C    | False | False | None |
| 15 | BACPointAnalogInput  | r_112_1_cio_13071_0 | pot.temperature bureau individuel s-sol                                 | analogInput  |   13071 |    20.40 | C    | False | False | None |
| 16 | BACPointAnalogOutput | r_112_1_cio_18176_0 | vanne depart radiateurs                                                 | analogOutput |   18176 |     0.00 | %    | False | False |  16  |
| 17 | BACPointAnalogOutput | r_112_1_cio_18177_0 | vanne depart general chauffage de sol                                   | analogOutput |   18177 |     0.00 | %    | False | False |  16  |
| 18 | BACPointAnalogOutput | r_112_1_cio_18178_0 | vannes depart chauffage de sol bureau direction rez                     | analogOutput |   18178 |     0.00 | %    | False | False |  16  |
| 19 | BACPointAnalogOutput | r_112_1_cio_18179_0 | vanne depart chauffage de sol bureau direction cote hall rez            | analogOutput |   18179 |     0.00 | %    | False | False |  16  |
| 20 | BACPointAnalogOutput | r_112_1_cio_18180_0 | vanne depart chauffage de sol bureau comptabilite rez                   | analogOutput |   18180 |     0.00 | %    | False | False |  16  |
| 21 | BACPointAnalogOutput | r_112_1_cio_18181_0 | vanne depart chauffage de sol bureau schematique s-sol                  | analogOutput |   18181 |     0.00 | %    | False | False |  16  |
| 22 | BACPointAnalogOutput | r_112_1_cio_18182_0 | vanne depart chauffage de sol bureau individuel s-sol                   | analogOutput |   18182 |     0.00 | %    | False | False |  16  |
| 23 | BACPointAnalogOutput | r_112_1_cio_18183_0 | consigne puissance bruleur                                              | analogOutput |   18183 |     5.00 | %    | False | False |  16  |
| 24 | BACPointBinaryInput  | r_112_1_cio_256_0   | circulateur depart radiateurs                                           | binaryInput  |     256 | inactive | None | False | False | None |
| 25 | BACPointBinaryInput  | r_112_1_cio_257_0   | thermique circulateur depart radiateurs                                 | binaryInput  |     257 | inactive | None | False | False | None |
| 26 | BACPointBinaryInput  | r_112_1_cio_258_0   | circulateur depart chauffage de sol                                     | binaryInput  |     258 | inactive | None | False | False | None |
...
| 49 | BACPointBinaryInput  | r_112_1_cio_513_0   | Pompe de fosse eau pluviale cote parking                                | binaryInput  |     513 | inactive | None | False | False | None |
| 50 | BACPointBinaryInput  | r_112_1_cio_514_0   | Interrupteur pompe de fosse eau pluviale cote parking                   | binaryInput  |     514 |   active | None | False | False | None |
| 51 | BACPointBinaryInput  | r_112_1_cio_515_0   | niveau haut fosse eau pluviale cote parking                             | binaryInput  |     515 | inactive | None | False | False | None |
| 52 | BACPointBinaryInput  | r_112_1_cio_516_0   | Surveillance tension coffret fosse eau pluviale cote parking            | binaryInput  |     516 | inactive | None | False | False | None |
| 53 | BACPointBinaryInput  | r_112_1_cio_534_0   | entree test 1                                                           | binaryInput  |     534 |   active | None | False | False | None |
| 54 | BACPointBinaryInput  | r_112_1_cio_535_0   | entree TEST 2                                                           | binaryInput  |     535 |   active | None | False | False | None |
| 55 | BACPointBinaryOutput | r_112_1_cio_7937_0  | cmd.bouilleur                                                           | binaryOutput |    7937 | inactive | None | False | False |  16  |
| 56 | BACPointBinaryOutput | r_112_1_cio_7938_0  | cmd.circulateur depart radiateurs                                       | binaryOutput |    7938 | inactive | None | False | False |  16  |
| 57 | BACPointBinaryOutput | r_112_1_cio_7939_0  | cmd.circulateur depart chauffage de sol                                 | binaryOutput |    7939 | inactive | None | False | False |  16  |
| 58 | BACPointBinaryOutput | r_112_1_cio_7941_0  | cmd.ventilateur extraction local chaufferie s-sol                       | binaryOutput |    7941 |   active | None | False | False |  16  |
| 59 | BACPointBinaryOutput | r_112_1_cio_8192_0  | cmd.feu tournant                                                        | binaryOutput |    8192 | inactive | None | False | False |  16  |
| 60 | BACPointBinaryOutput | r_112_1_cio_8193_0  | cmd.sirene                                                              | binaryOutput |    8193 | inactive | None | False | False |  16  |
| 61 | BACPointBinaryOutput | r_112_1_cio_8194_0  | cmd.tonalite sirene                                                     | binaryOutput |    8194 | inactive | None | False | False |  16  |
| 62 | BACPointBinaryOutput | r_112_1_cio_8195_0  | cmd.led activation (rouge)                                              | binaryOutput |    8195 | inactive | None | False | False |  16  |
| 63 | BACPointBinaryOutput | r_112_1_cio_8196_0  | cmd.PAC salle de conferences                                            | binaryOutput |    8196 | inactive | None | False | False |  16  |
| 64 | BACPointBinaryOutput | r_112_1_cio_8197_0  | cmd.radiateur electrique salle de conferences                           | binaryOutput |    8197 | inactive | None | False | False |  16  |
| 65 | BACPointBinaryOutput | r_112_1_cio_8198_0  | TEST LCH                                                                | binaryOutput |    8198 |   active | None | False | False |  16  |
+----+----------------------+---------------------+-------------------------------------------------------------------------+--------------+---------+----------+------+-------+-------+------+

>>> device.points.dump('sonde') # output can be filtered (by part of names or descriptions)
+----+---------------------+---------------------+-----------------------------------------------------+-------------+---------+-------+------+-------+-------+------+
| #  | class               | name                | description                                         | type        | address | value | unit |  COV  |  OoS  | PRI  |
+----+---------------------+---------------------+-----------------------------------------------------+-------------+---------+-------+------+-------+-------+------+
| 0  | BACPointAnalogInput | r_112_1_cio_13056_0 | sonde exterieure                                    | analogInput |   13056 | 38.42 | C    | False | False | None |
| 1  | BACPointAnalogInput | r_112_1_cio_13057_0 | sonde depart chaudiere                              | analogInput |   13057 | 26.07 | C    | False | False | None |
| 2  | BACPointAnalogInput | r_112_1_cio_13058_0 | sonde depart radiateurs                             | analogInput |   13058 | 31.20 | C    | False | False | None |
| 3  | BACPointAnalogInput | r_112_1_cio_13059_0 | sonde depart chauffage de sol                       | analogInput |   13059 | 27.12 | C    | False | False | None |
| 6  | BACPointAnalogInput | r_112_1_cio_13062_0 | sonde ambiance bureau direction rez                 | analogInput |   13062 | 26.24 | C    | False | False | None |
| 8  | BACPointAnalogInput | r_112_1_cio_13064_0 | sonde ambiance bureau direction cote hall rez       | analogInput |   13064 | 26.43 | C    | False | False | None |
| 10 | BACPointAnalogInput | r_112_1_cio_13066_0 | sonde ambiance salle de conferences                 | analogInput |   13066 | 27.81 | C    | False | False | None |
| 11 | BACPointAnalogInput | r_112_1_cio_13067_0 | sonde ambiance temperature bureau comptabilite  rez | analogInput |   13067 | 25.81 | C    | False | False | None |
| 12 | BACPointAnalogInput | r_112_1_cio_13068_0 | sonde ambiance bureau schematique s-sol             | analogInput |   13068 | 24.23 | C    | False | False | None |
| 14 | BACPointAnalogInput | r_112_1_cio_13070_0 | sonde ambiance bureau individuel s-sol              | analogInput |   13070 | 25.88 | C    | False | False | None |
+----+---------------------+---------------------+-----------------------------------------------------+-------------+---------+-------+------+-------+-------+------+

Each point of the BACPoints object is accessible by it’s index, type or a part of something belonging to it

>>> point=points[8]
>>> point
<BACPointAnalogInput(r_112_1_cio_13064_0:analogInput#13064=26.51 degreesCelsius)>

>>> point.dump()
+--------------+-----------------------------------------------+
| property     | value                                         |
+--------------+-----------------------------------------------+
| class        | BACPointAnalogInput                           |
| name         | r_112_1_cio_13064_0                           |
| description  | sonde ambiance bureau direction cote hall rez |
| type         | analogInput                                   |
| address      | 13064                                         |
| value        | 26.57267189025879                             |
| state        | 26.57                                         |
| unit         | degreesCelsius (C)                            |
| COV          | False                                         |
| OutOfService | False                                         |
| index        | 8                                             |
+--------------+-----------------------------------------------+

>>> point=device.points.analogInput(13056)
>>> point=bacnet[8015].points.analogOuput(18181)

>>> points['sonde hall'] # return the first object matching to this
<BACPointAnalogInput(r_112_1_cio_13064_0:analogInput#13064=26.55 degreesCelsius)>

>>> point=point['r_112_1_cio_13067_0']
>>> point=point['13067']

Points are exposed through BACPoint objects (generic class), derived in BACPointBinaryInput, BACPointBinaryOutput, BACPointAnalogInput, BACPointAnalogOutput, BACPointBinaryValue, BACPointAnalogValue, BACPointMultiStateInput, BACPointMultiStateOutput, BACPointMultiStateValue objects, each providing specialized BACPoint extensions. You will have to dig a bit into theses objects to learn what helper they provide. Using [bpython] (https://bpython-interpreter.org/) interactive interpreter with it’s autocompletion feature is a very convenient way to discover thoses object (with the actual lack of documentation)

>>> point.
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ activePriority               address                      bacnetProperty               bacnetproperties             celciusToFahrenheit          cov                                          │
│ covCancel                    description                  digDecimals                  digUnit                      digUnitStr                   dump                                         │
│ fahrenheitToCelcius          index                        isAnalog                     isBinary                     isCOV                        isMultiState                                 │
│ isOutOfService               isWritable                   label                        match                        name                         onInit                                       │
│ poll                         pollStop                     priority                     properties                   read                         refresh                                      │
│ reloadBacnetProperties       state                        toCelcius                    type                         unit                         unitNumber                                   │
│ value                                                                                                                                                                                         │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

>>> point.value
26.699626922607422
>>> point.unit
'degreesCelsius'

>>> point.value=12.0 # if a point is writable, this will change it's value
>>> point.write(12.0, priority=8)
>>> point.write(12.0, prop='presentValue', priority=8)

# for binary values
>>> point.on()
>>> point.off()
>>> point.toggle()

# for multiState values
>>> point.state
>>> point.label
>>> point.labels

If a BACPoint doesn’t expose something that would be useful, either ask it (we will try to add this support) or use the underlying point._bac0point object which is the BAC0’s Point object (https://bac0.readthedocs.io/en/latest/BAC0.core.devices.html#BAC0.core.devices.Points.Point) associated to this point.

We will try to add objetcs and methods docstring as soon as possible to help the use of theses objects. Please let us know ([e-mail]) is this is useful for someone.