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localimg.js
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localimg.js
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// Copyright 2017 DT42
//
// This file is part of BerryNet.
//
// BerryNet is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// BerryNet is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with BerryNet. If not, see <http://www.gnu.org/licenses/>.
// Read a local image and send it to inference server.
//
// subscribe
// dt42/localimg
// publish
// dt42/inference
// dt42/log
//
// $ node localimg.js
// $ mosquitto_pub -h localhost -t dt42/localimg -m <imgpath>
'use strict';
const mqtt = require('mqtt');
const fs = require('fs');
const config = require('./config');
const broker = config.brokerHost;
const client = mqtt.connect(broker);
const topicEventLocalImage = config.topicEventLocalImage;
const topicActionLog = config.topicActionLog;
const topicActionInference = config.topicActionInference;
function log(m) {
client.publish(topicActionLog, m);
console.log(m);
}
client.on('connect', () => {
client.subscribe(topicEventLocalImage);
log(`localimg client: connected to ${broker} successfully.`);
});
client.on('message', (t, m) => {
log(`camera client: on topic ${t}, received message ${m}.`);
const imgurl = m.toString();
// Take a local image as snapshot. The snapshot will be displayed
// on dashboard.
fs.readFile(imgurl, function(err, data) {
if (err) {
log('localimg client: cannot get image.');
} else {
log('localimg client: publishing image.');
client.publish(topicActionInference, data);
}
});
});