从IOT核心永远不会调用Lambda函数

Question

我在AWS中有一个lambda函数，只要从我的iot设备发送mqtt有效负载就应该调用它。我有一个iot规则设置，订阅mqtt主题，应该将有效负载从csv转换为json格式，但现在该函数永远不会被调用。

我已经检查过以确保mqtt主题是使用正确的有效负载发布的，而且肯定是。这是我的lambda函数的'index.js'。

var https = require('https');

exports.handler = (event, context, callback) => {
    //split lines in csv
    var lines = event.split("\n");
    var result = [];
    var headers = ["Timestamp","Temperature","humidity","counts_0.3","counts_0.5","counts_1","counts_2.5","counts_5","counts_10","pm1","pm2.5","pm10","pma1","pma2.5","pma10"];
    for (var i = 0; i < lines.length; i++) {
        var obj = {};
        var currentline = lines[i].split(",");
        for (var j = 0; j < headers.length; j++) {
            obj[headers[j]] = currentline[j];
        }
        result.push(obj);
    }

    //store json Object in postData to be published to Losant
    var postData = JSON.stringify(result); //JSON

    var options = {
        hostname: 'triggers.losant.com',
        port: 443,
        path: '/webhooks/nV2kS3GWzETodHeFin4vlLhoAwmqkFdtfdmGV7we',
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Content-Length': Buffer.byteLength(postData)
        }
    };

    var req = https.request(options, (res) => {
        console.log(`STATUS: ${res.statusCode}`);
        console.log(`HEADERS: ${JSON.stringify(res.headers)}`);
        res.setEncoding('utf8');
        res.on('data', (chunk) => {
            console.log(`BODY: ${chunk}`);
        });
        res.on('end', () => {
            callback();
        });
    });
    req.on('error', (e) => {
        console.log(`problem with request: ${e.message}`);
        callback();
    });
    // write data to request body
    req.write(postData);
    req.end();
};

以下是我的物联网规则的一些截图。

SQL查询 MQTT主题正在发布

从不调用函数