modem.js
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'use strict';
const INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS = 60000;
const DELIMITER_WAIT_FOR_OK = '\nOK\r\n';
const SerialPort = require('serialport');
const ParserReadline = require('@serialport/parser-readline');
const ParserDelimiter = require('@serialport/parser-delimiter');
const config = require('komodo-sdk/config');
const logger = require('komodo-sdk/logger');
const mutex = require('./mutex');
const common = require('./common');
const sms = require('./sms');
const dbCops = require('./db-cops');
const reportSender = require('./report-sender');
const msisdn = require('./msisdn');
const modemInfo = {
manufacturer: null,
model: null,
imei: null,
imsi: null,
msisdn: null,
cops: null,
networkId: null,
networkName: null,
signalStrength: null,
config: config.modem,
};
const port = new SerialPort(config.modem.device, { baudRate: 115200 });
const parserReadLine = new ParserReadline();
const parserWaitForOK = new ParserDelimiter({ delimiter: DELIMITER_WAIT_FOR_OK });
port.pipe(parserReadLine);
function writeToPort(data) {
return new Promise((resolve) => {
port.write(data, (err, bytesWritten) => {
if (err) logger.warn(`ERROR: ${err.toString()}`);
logger.verbose(`* OUT: ${data}`);
resolve(bytesWritten);
});
});
}
async function writeToPortAndWaitForOK(data) {
await mutex.setLockWaitForOK();
const result = await writeToPort(data);
await mutex.setLockWaitForOK();
mutex.releaseLockWaitForOK();
return result;
}
async function readSMS(slot) {
const parser = new ParserDelimiter({ delimiter: DELIMITER_WAIT_FOR_OK });
parser.on('data', async (data) => {
if (data) {
reportSender.incomingSMS(sms.extract(data.toString().trim()));
}
mutex.releaseLockWaitForOK();
});
logger.info(`Reading SMS on slot ${slot}`);
port.pipe(parser);
await writeToPortAndWaitForOK(`AT+CMGR=${slot}\r`);
port.unpipe(parser);
logger.verbose(`Finished reading SMS on slot ${slot}`);
logger.info(`Deleting message on slot ${slot}`);
port.pipe(parserWaitForOK);
await writeToPortAndWaitForOK(`AT+CMGD=${slot}\r`);
port.unpipe(parserWaitForOK);
logger.info('Message processing has completed');
}
function onIncomingSMS(data) {
const value = common.extractValueFromReadLineData(data);
if (!value) return;
const chunks = value.split(',');
if (!chunks && !chunks[1]) return;
const slot = chunks[1];
logger.info(`Incoming SMS on slot ${slot}`);
readSMS(slot);
}
function onCOPS(data) {
modemInfo.cops = common.extractValueFromReadLineData(data).trim();
logger.info(`Connected Network: ${modemInfo.cops}`);
if (!modemInfo.cops) return;
[, , modemInfo.networkId] = modemInfo.cops.split(',');
if (modemInfo.networkId) {
modemInfo.networkName = dbCops[modemInfo.networkId];
}
}
parserReadLine.on('data', (data) => {
logger.verbose(`* IN: ${data}`);
if (data) {
if (data.indexOf('+CSQ: ') === 0) {
modemInfo.signalStrength = common.extractValueFromReadLineData(data).trim();
logger.info(`Signal strength: ${modemInfo.signalStrength}`);
} else if (data.indexOf('+CMTI: ') === 0) {
onIncomingSMS(data);
} else if (data.indexOf('+COPS: ') === 0) {
onCOPS(data);
}
}
});
parserWaitForOK.on('data', () => {
mutex.releaseLockWaitForOK();
});
function simpleCommand(cmd, callback) {
const parser = new ParserDelimiter({ delimiter: DELIMITER_WAIT_FOR_OK });
parser.on('data', (data) => {
port.unpipe(parser);
mutex.releaseLockWaitForOK();
if (data) {
callback(null, data.toString().trim());
}
});
port.pipe(parser);
writeToPortAndWaitForOK(cmd);
}
function readManufacturer() {
return new Promise((resolve) => {
simpleCommand('AT+CGMI\r', (err, result) => {
modemInfo.manufacturer = result;
logger.info(`Manufacturer: ${result}`);
resolve(result);
});
});
}
function readModel() {
return new Promise((resolve) => {
simpleCommand('AT+CGMM\r', (err, result) => {
modemInfo.model = result;
logger.info(`Model: ${result}`);
resolve(result);
});
});
}
function readIMEI() {
return new Promise((resolve) => {
simpleCommand('AT+CGSN\r', (err, result) => {
modemInfo.imei = result;
logger.info(`IMEI: ${result}`);
resolve(result);
});
});
}
function readIMSI() {
return new Promise((resolve) => {
simpleCommand('AT+CIMI\r', (err, result) => {
modemInfo.imsi = result;
logger.info(`IMSI: ${result}`);
if (result) {
modemInfo.msisdn = msisdn[result];
if (modemInfo.msisdn) {
logger.info(`MSISDN: ${modemInfo.msisdn}`);
}
}
resolve(result);
});
});
}
async function querySignalStrength() {
port.pipe(parserWaitForOK);
await writeToPortAndWaitForOK('AT+CSQ\r');
port.unpipe(parserWaitForOK);
}
async function registerSignalStrengthBackgroundQuery() {
logger.info('Registering background signal strength query');
setInterval(() => {
querySignalStrength();
}, INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS);
}
async function sendSMS(destination, msg) {
if (typeof destination !== 'string' || typeof msg !== 'string' || !destination.trim() || !msg.trim()) return;
await mutex.setLockWaitForCommand();
logger.info('Sending message', { destination, msg });
const correctedDestination = `+${destination}`.replace(/^0/, '62').replace(/^\++/, '+');
port.pipe(parserWaitForOK);
await writeToPortAndWaitForOK('AT+CMGF=1\r');
await writeToPortAndWaitForOK(`AT+CMGS="${correctedDestination}"\n${msg}${Buffer.from([0x1A])}`);
port.unpipe(parserWaitForOK);
logger.info('Message has been sent');
mutex.releaseLockWaitForCommand();
}
function init() {
port.on('open', async () => {
port.pipe(parserWaitForOK);
logger.info('Modem opened');
await writeToPortAndWaitForOK('AT\r');
logger.info('Initializing modem to factory set');
await writeToPortAndWaitForOK('AT&F\r');
logger.info('Disabling echo');
await writeToPortAndWaitForOK('ATE0\r');
await writeToPortAndWaitForOK('AT+COPS?\r');
logger.info('Querying signal strength');
await writeToPortAndWaitForOK('AT+CSQ\r');
await readManufacturer();
await readModel();
await readIMEI();
await readIMSI();
if (!config.disable_delete_inbox_on_startup) {
logger.info('Deleting existing messages');
await writeToPortAndWaitForOK('AT+CMGD=0,4\r');
}
port.unpipe(parserWaitForOK);
registerSignalStrengthBackgroundQuery();
logger.verbose('Init completed');
});
}
init();
exports.modemInfo = modemInfo;
exports.sendSMS = sendSMS;