node-red-contrib-time-converter/dec-to-ascii.js

A Node-RED node that converts seconds to mm:ss format and outputs it.

module.exports = function(RED) {
    function DecToAsciiNode(config) {
        RED.nodes.createNode(this, config);
        const node = this;

        node.on("input", function(msg, send, done) {
            try {
                if (Array.isArray(msg.payload)) {
                    msg.payload = msg.payload
                        .slice(0, 32)
                        .map(num => String.fromCharCode(num & 0xff))
                        .join("");

                    msg.topic = `msg.payload=msg.payload.slice(0,32).map(num => String.fromCharCode(num & 0xff)).join("")`;
                } else {
                    msg.payload = "錯誤：msg.payload 不是陣列";
                    node.warn("msg.payload 必須為十進位數字陣列");
                }

                send(msg);
                if (done) done();
            } catch (err) {
                if (done) done(err);
                else node.error(err, msg);
            }
        });
    }

    RED.nodes.registerType("dec-to-ascii", DecToAsciiNode);
};