Trying to publish a message to MQTT test client

[Rishi-NF]

Hi

So im trying to publish a message to the MQTT test client and after running my code

Connected!
Begin Publish
Published: '{"message": "Hello World [1]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [2]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [3]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [4]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [5]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [6]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [7]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [8]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [9]"}' to the topic: $aws/events/subscriptions/+/demoThing
Published: '{"message": "Hello World [10]"}' to the topic: $aws/events/subscriptions/+/demoThing
Publish End
Disconnecting...
Disconnected!

Im seeing this with no errors but when i check the mqtt test console my messages havent appeared.

[MikeDombo]

It isn't valid to publish on wildcard topics (+). Also publishing on reserved topics ($aws/) will not be received by any different subscriber such as the aws console. Reserved topics have very particular uses.

Publish to a normal topic like "hello/world"

[Rishi-NF]

what should i name my topic if i have my policy set up like:

{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "VisualEditor0",
"Effect": "Allow",
"Action": "iot:Connect",
"Resource": "arn:aws:iot:eu-west-2:440369758575:client/Client_ID"
},
{
"Sid": "VisualEditor1",
"Effect": "Allow",
"Action": "iot:Publish",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topic/test/topic"
},
{
"Sid": "VisualEditor2",
"Effect": "Allow",
"Action": "iot:Subscribe",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topicfilter/test/topic"
}
]
}

also trying to get this bit of code to work (is it ok for me to define TOPIC as this: "test/demoTopic"):
RANGE = 10
MESSAGE = "Hello World"
TOPIC = "test/demoTopic"
print('Begin Publish')
for i in range(RANGE):
data = "{} [{}]".format(MESSAGE, i + 1)
message = {"message": data}
mqtt_connection.publish(topic=TOPIC, payload=json.dumps(message), qos=mqtt.QoS.AT_LEAST_ONCE)
print("Published: '" + json.dumps(message) + "' to the topic: " + f"{TOPIC}")
t.sleep(0.1)
print('Publish End')

[Rishi-NF]

It isn't valid to publish on wildcard topics (+). Also publishing on reserved topics ($aws/) will not be received by any different subscriber such as the aws console. Reserved topics have very particular uses.

Publish to a normal topic like "hello/world"

Code im trying to get to work:

RANGE = 10
MESSAGE = "Hello World"
TOPIC = "test/demoTopic"
print('Begin Publish')
for i in range(RANGE):
data = "{} [{}]".format(MESSAGE, i + 1)
message = {"message": data}
mqtt_connection.publish(topic=TOPIC, payload=json.dumps(message), qos=mqtt.QoS.AT_LEAST_ONCE)
print("Published: '" + json.dumps(message) + "' to the topic: " + f"{TOPIC}")
t.sleep(0.1)
print('Publish End')

My IOT Policy:

{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "VisualEditor0",
"Effect": "Allow",
"Action": "iot:Connect",
"Resource": "arn:aws:iot:eu-west-2:440369758575:client/Client_ID"
},
{
"Sid": "VisualEditor1",
"Effect": "Allow",
"Action": "iot:Publish",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topic/test/topic"
},
{
"Sid": "VisualEditor2",
"Effect": "Allow",
"Action": "iot:Subscribe",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topicfilter/test/topic"
}
]
}

My IAM policy for Auth_Role Users:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "VisualEditor0",
"Effect": "Allow",
"Action": "iot:Connect",
"Resource": "arn:aws:iot:eu-west-2:440369758575:client/Client_ID"
},
{
"Sid": "VisualEditor1",
"Effect": "Allow",
"Action": "iot:Publish",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topic/test/topic"
},
{
"Sid": "VisualEditor2",
"Effect": "Allow",
"Action": "iot:Subscribe",
"Resource": "arn:aws:iot:eu-west-2:440369758575:topicfilter/test/topic"
}
]
}

Objective: Trying to publish a message back to the MQTT test client console but my messages never appear there ☹️. Using the V2 SDK on the Cognito_connect Example in their samples.

[MikeDombo]

If you look at the policy you provided, the topic that you are allowed to publish on should be pretty clear, it is test/topic.

test/topic is not the topic that you set the code to use.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.