| Re: [paho-dev] MQTT Paho doesn't return disconnection on network loss |
Hi,
version 1.3.8 is over 3 years old now, and there have been
changes affecting keep alive, so I would try the latest release
1.3.13.
Ian Craggs
Hi,
I tried to send small messages using the MQTT protocol to a server:
Environment:Docker on Ubuntu 22.04.3 LTS (x86-64)
Libraries used: paho.mqtt.c-1.3.13, paho.mqtt.cpp-1.3.2
Steps Performed:I am connected to the MQTT broker.I start sending messages.The Internet is disconnected.With no internet connection, I am still sending messages. At some point, paho reports that the buffer is full.(KeepAlive time is 20 secs. Considering tiny messages, I believe it's good enough).
Observed behavior:PING request is initiated from the library.Disconnection is reported to the client only when there are no messages being sent in the disconnected state.
Expected behavior:
Disconnection is reported to the client even if messages are being sent in the disconnected state.
Query:1. Is this a known issue or is it expected behavior? If it's an issue, is it fixed on the latest source code (at least I don't see any relevant commits)?2. I could see there is something like: m->c->net.lastSent = MQTTTime_now(); I believe, lastSent doesn't care if it's a message successfully sent or an unsuccessful(buffered) message. Is my understanding correct?
Please let me know if my understanding is wrong on any of the things mentioned above.Thank you!
On Wed, Feb 14, 2024 at 8:55 PM kunal takalkar <kstisha2012@xxxxxxxxx> wrote:
Hi,
I am trying to send small messages using the MQTT protocol to a server.
Environment:Docker on Ubuntu 22.04.3 LTS (x86-64)
Libraries used: paho.mqtt.c-1.3.8, paho.mqtt.cpp-1.2.0
Steps Performed:I am connected to the MQTT broker.I start sending messages.The Internet is disconnected.With no internet connection, I am still sending messages. At some point, paho reports that the buffer is full.(KeepAlive time is 20 secs. Considering tiny messages, I believe it's good enough).
Observed behavior:PING request is not initiated from the library.No disconnection is reported to the client
Expected behavior:PING Request should be initiated. If PINGRESP is not received within the keepalive interval, disconnection should be reported to the client.
Query:Is this a known issue?If yes, is it already fixed in any of the latest releases?
I have attached the logs for reference.
Please let me know if my understanding is wrong on any of the things mentioned above.Thank you,
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