When I build a own python app, then it's clear for me. But I would like to use the Python Runtime App with a simple *.py file and I only see this commands here:
- datalayer.browse
- datalayer.read
- datalayer.write
- datalayer.create
- datalayer.remove
- datalayer.read_json
- datalayer.write_json
- datalayer.create_json
See: Script Parser/Interpreter (Python) - Bosch Rexroth Produktinformationsportal
See my short example too, which is working well with datalayer.read() and datalayer.write():
But the question is, are there any commands to subscribe?
The code below, which creates a subscription and dumps the result into the diagnostics log, is similar to the source code of the library in question. You can run this directly with the Python Runtime app.
import requests
from urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning)
session = requests.Session()
session.verify = False
response = session.post("https://localhost/identity-manager/api/v2/auth/token", json={"name":"boschrexroth","password":"boschrexroth"}).json()
token = response['access_token']
data = {"Authorization": f"Bearer {token}"}
with session.get("https://localhost/automation/api/v2/events?nodes=framework/metrics/system/cpu-utilisation-percent&publishIntervalMs=5000", headers=data, stream=True) as stream:
for line in stream.iter_lines():
tmp = line.decode("utf-8").split(":",1)
if len(tmp) > 1 and tmp[0] == 'data':
print(tmp[1], flush=True)
Output:
I tried a simillar aproche like @LunatiX without success:
Starting point is the documentation here https://docs.automation.boschrexroth.com/doc/289678356/introduction-and-overview/latest/en/
I tried to use the subscription methods from the ctrlxdatalayer library:
create_properties to generate the Rulset
and then the subscription_async class for the subscription
However, I already run into a problem with the following simple code:
from ctrlxdatalayer import subscription
print("Make subscription to one node")
itemProperty = subscription.create_properties("opcuaclient/SPS/i=85/ns=2;s=Logic/ns=2;s=.I40_PartIndetifier", 100, 60000, 10000)
print(str(itemProperty))
print("Property done")
- Running the code in the IDE as single file (Debug: Python: current file): All fine, no error.
- Running the code in the Python script engine (Debug: Launch Python in Script Egnine):
OSError('libcomm_datalayer.so: cannot open shared object file: No such file or directory')
Is this the correct way to establish a subscription to multiple data layer items?
What am I missing?
Regards
Reto
@Reto :
From the documentation for the Python Runtime Environment:
The library providing datalayer access that is integrated into the Python Runtime App - the one that @LunatiX refers to in his original post - is built on REST calls using the requests module. Because ctrlxdatalayer requires libcomm_datalayer.so, as far as I know there is no way to use it in this context.
To create multiple subscriptions in a single REST call, see @CodeShepherd's post here.