Unable to connect to MQTT database on a VM instance from AppEngine.

[Rajkumar Godi]

Hi All,

I am having issues connecting by MQTT database on VM instance from an application installed on App Engine. I am getting below messages. Please let me know if you have any idea on this. Thank you!.

A  error: Mqtt reconnect 
 
A  info: MQTT Connected ------------------ MQTT_CLIENT_32 
 
A  error: Mqtt offline 
 
A  Mqtt offline 
 
A  error: Mqtt offline 
 
A  Mqtt offline 
 
A  error: Mqtt reconnect 
 
A  info: MQTT Connected ------------------ MQTT_CLIENT_32 
 
A  error: Mqtt reconnect 
 
A  info: MQTT Connected ------------------ MQTT_CLIENT_32 
 
A  180919/102607.004, [ops] memory: 212Mb, uptime (seconds): 56381.156, load: [0.0185546875,0.037109375,0. 001953125]
 
A  Mqtt offline 
 
A  error: Mqtt offline

[George (Cloud Platform Support)]

Hello Rajkumar, 

Is your VM instance running in Google Cloud Platform? Do you run your VM instance in your own local server? What DBMS have you implemented? Do you refer to a Cloud SQL instance? How do you connect from your app in App Engine to your VM? A little more detail on your setup should definitely help. 

[Rajkumar Godi]

Hi George,

Yes, my setup is entirely on GCP. I do not refer to Cloud SQL. I have installed MongoDB on a VM instance in compute engine, I also have MQTT installed on the same VM Instance. I have not trouble connecting MongoDB to App Enigne, but connection to MQTT is failing with the error lines I provide in my previous post. Please let me know if you need more details. Appreciate any help in this regard.

Regards,

Raj.

On Fri, Sep 21, 2018 at 5:50 AM 'George (Cloud Platform Support)' via Google App Engine <google-a...@googlegroups.com> wrote:

Hello Rajkumar, 

Is your VM instance running in Google Cloud Platform? Do you run your VM instance in your own local server? What DBMS have you implemented? Do you refer to a Cloud SQL instance? How do you connect from your app in App Engine to your VM? A little more detail on your setup should definitely help. 

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[George (Cloud Platform Support)]

Hi Rajkumar, 

You should configure the GCE instance's firewall to allow traffic to port 1883, or whatever port is needed for MQTT. You may gather more detail from the "Virtual Private Cloud (VPC) Network Overview" documentation page. 

As MQTT is not a supported product, you are responsible for its proper configuration, as generally for the proper working of your VM instance in GCE.