emqx
Mqtt plugin message payload error 3017 for multiple tags publish
I have created a northbound app and it has a group having 9 tags in it.
All the subscription to southbound apps is there. Issue: When trying to publish message to mqtt broker address of north app, it throws mqtt payload error 3017.
The above case is only when I publish message where multiple tags are passed inside an array to tags attribute of message dict.
Although if i try to publish a message with single tag without any array, it works perfectly fine.
PS: I am using neuronEX. Code snippet example:
def on_message(client, userdata, message):
payload = json.loads(message.payload.decode())
if not 'error' in payload.keys() or payload['error'] != 0:
print(f"Received message on {message.topic}: {payload}")
client = mqtt.Client(client_id=client_id)
client.on_message = on_message
client.connect(broker_ip, broker_port, 60)
client.loop_start()
client.subscribe("northappwriteresphost", qos=1)
msg = {
"group": "example-grp",
"node": "server-DC",
"tags": [
{
"tag": "gate",
"value": 11.0
},
{
"tag": "brush",
"value": 101.0
},
{
"tag": "solids",
"value": 16.0
},
{
"tag": "width",
"value": 25.0
},
{
"tag": "length",
"value": 150.0
},
{
"tag": "line",
"value": 500.0
},
{
"tag": "weight",
"value": 0.3732195710002935
},
{
"tag": "load",
"value": 29.32012949778306
},
{
"tag": "coeff",
"value": 8.728136979594593e-06
}
],
"uuid": "cd32be1b-c8b1-3257-94af-77f847b1ed3e"
}
topic = 'xxxxx'
client.publish(topic, json.dumps(msg), qos=1)
client.loop_stop()
client.disconnect()
3017 meas that the driver used for writing multiple tags does not yet support writing multiple tags in a single message
3017 meas that the driver used for writing multiple tags does not yet support writing multiple tags in a single message
By driver you mean the plugin we're using in southbound devices ? Or is the protocol version?
I'm using Allen-Bradley-ControlLogix 5500 plugin.
I'm new to this, so pardon for my silly doubts.
3017 meas that the driver used for writing multiple tags does not yet support writing multiple tags in a single message
By driver you mean the plugin we're using in southbound devices ? Or is the protocol version?
I'm using Allen-Bradley-ControlLogix 5500 plugin.
I'm new to this, so pardon for my silly doubts.
Yes, Allen-Bradley 5500 plugin does not currently support writing multiple tags in a single message, future version will support.