https://github.com/andreasheine/opcua-sub-to-websocket
OPC UA Server -> OPC UA Client / WebSocket Server -> WebSocket Client
https://github.com/andreasheine/opcua-sub-to-websocket
opc-ua opcua opcua-client opcua-gateway opcua-server python3 websocket-client websocket-server websockets
Last synced: about 2 months ago
JSON representation
OPC UA Server -> OPC UA Client / WebSocket Server -> WebSocket Client
- Host: GitHub
- URL: https://github.com/andreasheine/opcua-sub-to-websocket
- Owner: AndreasHeine
- Created: 2020-05-30T14:03:55.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2021-06-12T20:03:17.000Z (almost 4 years ago)
- Last Synced: 2025-03-26T15:48:05.492Z (2 months ago)
- Topics: opc-ua, opcua, opcua-client, opcua-gateway, opcua-server, python3, websocket-client, websocket-server, websockets
- Language: Python
- Homepage:
- Size: 946 KB
- Stars: 13
- Watchers: 3
- Forks: 5
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# opcua-sub-to-websocket
### OPC UA Server -> OPC UA Client / WebSocket Server -> WebSocket Client
You can use this to push data from a "OPC UA Subscription" over a WebSocket to the Browser/WebSocket-Client
"opcua-sub-to-websocket" can support multiple WebSocket-Clients and pushes all received subscription-notifications to all WebSocket-Clients.
Startup on Localhost:
```
Console1: python server.py
Console2: python client.py
Console3: python ws_client.py
And as many Browser instances of test.html as you want!
```
Provided is a sample "OPC UA Server" which generates random events and datachanges!
The timing can be adjusted in server.py:
```python
async def random_updater(random_node):
while True:
await asyncio.sleep(random.randint(1,10)/10) #<-------------
random_node.set_value(ua.DataValue(ua.Variant(random.randint(70,90), ua.VariantType.UInt64)))
print(datetime.now(), "datachange")
async def event_gen(myevgen):
count = 0
while 1:
await asyncio.sleep(random.randint(1,10)/10) #<-------------
myevgen.event.Message = ua.LocalizedText("MyFirstEvent %d" % count)
myevgen.event.Severity = count
myevgen.event.MyNumericProperty = count
myevgen.event.MyStringProperty = "Property " + str(count)
myevgen.trigger()
count += 1
print(datetime.now(), "event")
```
also provided is a test HTML-Page with some basic JavaScript to connect/reconnect to WebSockets:
```html
Andreas Heine
var content = {}
let data
function connect() {
let url = "ws://127.0.0.1:8000";
let s = new WebSocket(url);
s.onopen = function(event) {
console.log(event);
}
s.onclose = function(event) {
console.log(event);
setTimeout(function() {
connect();
}, 2000);
}
s.onerror = function(event) {
console.log(event);
}
s.onmessage = function(event){
data = JSON.parse(event.data);
//console.log(data);
if (data.topic == "datachange notification"){
content[data.payload.node] = {
value: data.payload.value,
data: data.payload.data,
};
}
if (data.topic == "event notification"){
content["Event"] = data;
}
if (data.topic == "status change notification"){
content["Status"] = data;
}
document.getElementById("content").innerHTML = JSON.stringify(content);
}
}
connect();
```
aswell as an python based WebSocket Client :
```python
import asyncio, websockets
async def request():
uri = "ws://127.0.0.1:8000"
async with websockets.connect(uri) as websocket:
while 1:
msg = await websocket.recv()
print(msg)
asyncio.get_event_loop().run_until_complete(request())
```
Interested? Contact me: [email protected]