modem-tester.js
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const SerialPort = require('serialport');
const config = require('komodo-sdk/config');
const logger = require('komodo-sdk/logger');
const ParserInterByteTimeout = require('@serialport/parser-inter-byte-timeout');
const parsers = require('./lib/serialport-parsers');
const modemCommands = require('./lib/modem-commands');
const parserInterByteTimeout = new ParserInterByteTimeout({ interval: 1000 });
parserInterByteTimeout.on('data', (data) => {
logger.verbose('INCOMING', { parser: 'parserInterByteTimeout', data: data.toString() });
});
let port;
function sleep(ms) {
return new Promise((resolve) => {
setTimeout(() => {
resolve();
}, ms || 0);
});
}
function writeToPort(data) {
return new Promise((resolve) => {
port.write(data, (err, bytesWritten) => {
if (err) logger.warn(`ERROR: ${err.toString()}`);
logger.verbose('OUTGOING', { bytesWritten, data: data.toString() });
resolve(bytesWritten);
});
});
}
async function writeToPortDelayed(data, ms) {
await sleep(ms || 500);
const result = writeToPort(data);
return result;
}
port = new SerialPort(config.modem.device, { baudRate: 115200 }, async (err) => {
if (err) {
logger.warn(`Error opening modem. ${err}. Terminating modem ${config.modem.device}.`);
process.exit(1);
}
await writeToPortDelayed('AT\r');
const commands = [
'AT&FE0\r',
'AT+CGSN\r',
'AT+CIMI\r',
'AT+COPS?\r',
];
const commandsCount = commands.length;
// eslint-disable-next-line no-plusplus
for (let i = 0; i < commandsCount; i++) {
// eslint-disable-next-line no-await-in-loop
await writeToPortDelayed(commands[i], 2000);
}
if (config && config.modem_tester && config.modem_tester.commands
&& config.modem_tester.commands.length) {
const additionalCommandsLength = config.modem_tester.commands.length;
// eslint-disable-next-line no-plusplus
for (let i = 0; i < additionalCommandsLength; i++) {
// eslint-disable-next-line no-await-in-loop
await writeToPortDelayed(config.modem_tester.commands[i], 2000);
}
}
setInterval(() => {
modemCommands.querySignalQuality();
}, 30000);
});
parsers.setPort(port);
if (config && config.modem_tester && config.modem_tester.parser === 'regex') {
logger.info('Using parserWaitForOkOrError');
port.pipe(parsers.parserWaitForOkOrError);
} else if (config && config.modem_tester && config.modem_tester.parser === 'interbyte') {
logger.info('Using parserInterByteTimeout');
port.pipe(parserInterByteTimeout);
} else {
logger.info('Using parserReadline');
port.pipe(parsers.parserReadline);
}