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modem.js
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modem.js
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"use strict";
import { debuglog } from 'util';
import * as async from "async";
import { SerialPort } from 'serialport';
const debug = debuglog('gsm2');
/**
* [Modem description]
* @param {[type]} options [description]
*/
export class Modem extends SerialPort {
constructor(port, options) {
Object.assign(options, {
retry: 0,
timeout: 5000,
dataBits: 8,
stopBits: 1,
baudRate: 115200,
autoOpen: false
}, options);
super({
path: port,
...options
});
this.options = options;
var output = '';
var regexp = /(\r?(.+)\r)?\r\n(.+)\r\n$/;
this.on('data', chunk => {
output += chunk;
if (/>/.test(output)) {
this.emit('message', output);
output = '';
return;
}
if (regexp.test(output)) {
var m = regexp.exec(output);
this.emit('message', m[3], m);
output = '';
}
}).on('message', message => {
var p = message.split(/:\s?/);
if (p.length === 2) this.emit(p[0], p[1]);
});
this.queue = async.queue((task, done) => {
debug('task', task);
// Syntax:
// AT<command ...><CR>
this.write(task.data + '\r', () => this.drain());
function onMessage(message) {
clearInterval(this.retry);
clearTimeout(this.timeout);
if (/ERROR/.test(message)) {
task.reject(message);
} else {
task.accept(message);
}
this.removeListener('message', onMessage);
done();
}
this.on('message', onMessage);
// to temporary disable timeout use: null, 0, false
if ((task.timeout !== undefined ? task.timeout : this.options.timeout)) {
this.timeout = setTimeout(() => {
clearInterval(this.retry);
task.reject(new Error('Timeout exceeded'));
this.removeListener('message', onMessage);
done();
}, +(task.timeout || this.options.timeout));
}
// to temporary disable retry use: null, 0, false
if ((task.retry !== undefined ? task.retry : this.options.retry)) {
this.retry = setInterval(() => {
this.write(task.data + '\r', () => this.drain());
}, +(task.retry || this.options.retry));
}
});
}
send(data, options) {
var command = Object.assign({ data }, options || {});
command.promise = new Promise((accept, reject) => {
command.accept = accept;
command.reject = reject;
});
this.queue.push(command);
return command.promise;
}
test(cmd) {
return this.send(`AT+${cmd}?`);
}
exec(cmd) {
return this.send(`AT+${cmd}`);
}
get(name) {
return this.send(`AT+${name}=?`);
}
set(name, value, options) {
return this.send(`AT+${name}=${value}`, options);
}
reset() {
return this.send('ATZ');
}
save() {
return this.send('AT&W');
}
factory() {
return this.send('AT&F');
}
clock() {
return this.test('CCLK');
}
debug(n = 0) {
return this.set('CMEE', n);
}
echo(n = 0) {
return this.exec('ATE' + n);
}
id() {
return this.send('ATI');
}
sn() {
// TODO:
}
imsi() {
return this.test('CIMI').then(isOK => isOK && this.exec('CIMI'));
}
model() {
return this.test('CGMM').then(isOK => isOK && this.exec('CGMM'))
}
version() {
// AT+CGMR
return this.test('GMR').then(isOK => isOK && this.exec('GMR'))
}
manufacturer() {
// AT+CGMI
return this.test('GMI').then(isOK => isOK && this.exec('GMI'))
}
signal_strength() {
return this.test('CSQ').then(() => {
// this.get('CSQ').then(res => {
// return res.match(/\+CSQ:\s(.+)/)[1];
// });
return this.exec('CSQ').then(res => {
res = res.match(/\+CSQ:\s*(.+)/);
res = res[1].split(',');
return {
rssi: res[0],
ber: res[1]
};
})
});
}
dial(number) {
return this.send(`ATD${number};`);
}
hangup() {
return this.send('ATH');
}
}