MQTT Mosquitto Broker 不发送所有保留的消息

Question

我在接收来自 Mosquitto 代理的所有保留消息时遇到问题。代理已启动，我有一个单独的程序用 3000 条保留设置为 true 的消息填充代理。当我使用我的客户端连接时，我只收到 1020 条消息。我错过了什么以及如何获取所有保留消息。

我正在使用 WPF 应用程序 (Net Framework 4.6.2) 和 python 脚本。结果与两者相同。另外，我正在使用通配符订阅。

Mosquitto 版本 2.0.10 配置文件如下：

acl_file ./configs/acl.acl
password_file ./configs/pwfile
allow_anonymous false
listener 8883
cafile ./certs/ca.crt
certfile ./certs/root.crt
keyfile ./certs/root.key
tls_version tlsv1.2

ACL 文件：

user TestUser
topic read public/read/alarm/#
topic write public/write/alarm/#

Answer 1

来自mosquitto man page：

max_inflight_messages count

The maximum number of outgoing QoS 1 or 2 messages that can be in the process of being transmitted simultaneously. This includes messages currently going through handshakes and messages that are being retried. Defaults to 20. Set to 0 for no maximum. If set to 1, this will guarantee in-order delivery of messages.

max_queued_messages count

The maximum number of QoS 1 or 2 messages to hold in the queue (per client) above those messages that are currently in flight. Defaults to 1000. Set to 0 for no maximum (not recommended). See also the queue_qos0_messages and max_queued_bytes options.

由于您的配置不包含这些选项中的任何一个，默认值 20（最大飞行）和 1000（最大排队）开始生效，因此在您连接时接收最多 1020 条消息是预期的结果。如果您希望 Mosquitto 存储更多消息，请将 max_queued_messages x 添加到您的 mosquitto.conf（其中 x 是最大消息数或 0 表示无限制）。

MQTT Mosquitto Broker 不发送所有保留的消息

MQTT Mosquitto Broker does not sent all retained messages

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