show your reconn_setting and log

When I start the service and disconnect the network for a period of time, then restore the connection, it keeps triggering the [onClose] and [onConnect] callback repeatedly. The following logs are outputted in the libhv.log file:

2023-05-18 09:49:25.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:49:25.861 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:49:50.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:49:50.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:50:01.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:50:01.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:50:12.860 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]
2023-05-18 09:50:12.861 ERROR mqtt no pong! [mqtt_client.c:51:mqtt_send_ping]

Here is my reconn_setting

p_mqtt = new hv::MqttClient();
reconn_setting_t reconn;
reconn_setting_init(&reconn);
reconn.min_delay = 1000;
reconn.max_delay = 10000;
reconn.delay_policy = 2;
p_mqtt->setReconnect(&reconn);
p_mqtt->setPingInterval(10);

Log is very clear, your mqtt server not response pong, you can try setPingInterval(0) to control not to send ping.

I did a packet capture test with wireshark.

When I start the program, the program can send ping normally, and the server can also send pong normally. Then when I disconnect from the network for a period of time, the program’s reconnection mechanism will be triggered. At this time, the program will no longer actively send ping, so it cannot jump out of the reconnection loop.