问题描述
我正在根据 PubSubClient debsahu/ESP-MQTT-AWS-IoT-Core"rel =" nofollow noreferrer>此示例以连接到AWS IoT.具体来说，我正在尝试使用 AWS IoT Fleet Provisioning ，其中涉及订阅和发布一些特殊的 $ aws/主题.
I'm using PubSubClient per this example to connect to AWS IoT. Specifically, I'm trying to use AWS IoT Fleet Provisioning, which involves subscribing and publishing to some special $aws/ topics.
连接正确建立，并且CloudWatch日志显示成功的 Connect ， Subscribe ， Publish-In 和 Publish-Out事件.但是，每当MCU收到一条消息时，它似乎就会断开连接.有什么作用?
The connection is being established correctly, and CloudWatch logs show successful Connect, Subscribe, Publish-In and Publish-Out events. However, whenever the MCU receives a message, it appears to drop the connection. What gives?
推荐答案
调试PubSubClient显示底层的 WiFiClientSecure 实例由于以下错误而失去连接:
Debugging PubSubClient showed that the underlying WiFiClientSecure instance was losing connection due to the following error:
BR_ERR_TOO_LARGE: Incoming record is too large to be processed, or buffer is too small for the handshake message to send.
我收到的消息约为4 KB，因此我必须添加以下内容:
The message I was receiving was about 4 KB, so I had to add the following:
wifi_ = new WiFiClientSecure();
wifi_->setBufferSizes(4096, 512);
从那里开始，PubSubClient有了自己的缓冲区，我也不得不提高它:
From there, it turned out PubSubClient had its own buffer, which I also had to raise:
mqtt_ = new PubSubClient(*wifi_);
mqtt_->setBufferSize(4096);
进行这些更改使我能够成功地从AWS IoT接收这些消息.
Making these changes allowed me to receive these messages from AWS IoT successfully.
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