Add longsms support to client

cliOptions.js

@@ -68,6 +68,11 @@ const clientOptions = [
 		defaultOption: 1000,
 		description: "Default max rate for metrics/bars."
 	},
+	{
+		name: "longsms",
+		type: Boolean,
+		description: "Split messages into multiple parts. Applies only if message is too big for one packet."
+	},
 ];
 
 const centerOptions = [
@@ -151,6 +156,11 @@ const centerOptions = [
 		defaultOption: 1000,
 		description: "Default max rate for metrics/bars."
 	},
+	{
+		name: "longsms",
+		type: Boolean,
+		description: "Split messages into multiple parts. Applies only if message is too big for one packet."
+	},
 ];
 
 module.exports = { clientOptions, centerOptions };

client.js

@@ -64,7 +64,7 @@ function startInterval(session, sessionLogger, metrics) {
 					short_message: options.message,
 				});
 
-				sendPdu(session, pdu)
+				sendPdu(session, pdu, sessionLogger, options.longsms)
 					.then((resp) => {
 						inFlight--;
 						sessionLogger.info(`Received response with id ${resp.message_id}`);

utils.js

@@ -1,3 +1,5 @@
+const smpp = require("smpp");
+
 function verifyExists(value, err, logger) {
 	if (!value) {
 		logger.error(err);
@@ -14,15 +16,87 @@ function verifyDefaults(options, definitions) {
 	}
 }
 
-async function sendPdu(session, pdu) {
+function getCharacterSizeForEncoding(pdu) {
+	let encoding = pdu.data_coding;
+	if (!encoding) {
+		encoding = 0;
+	}
+	let characterSizeBits = 0;
+	switch (encoding) {
+		case 0:
+			characterSizeBits = 7;
+			break;
+		case 1:
+			characterSizeBits = 8;
+			break;
+		case 8:
+			characterSizeBits = 16;
+			break;
+	}
+	return characterSizeBits;
+}
+
+const maxMessageSizeBits = 1072;
+function splitToParts(pdu) {
+	const charSize = getCharacterSizeForEncoding(pdu);
+	const maxMessageLength = maxMessageSizeBits / charSize;
+
+	const splitMessage = [];
+	const message = pdu.short_message;
+	const messageLength = message.length;
+	const messageCount = Math.ceil(messageLength / maxMessageLength);
+	for (let i = 0; i < messageCount; i++) {
+		splitMessage.push(message.substr(i * maxMessageLength, maxMessageLength));
+	}
+
+	const pdus = [];
+	splitMessage.forEach((messagePart, index) => {
+		let udh = Buffer.from([0x05, 0x00, 0x03, this.iterator++, messageCount, index + 1]);
+
+		let partPdu = new smpp.PDU(pdu.command, { ...pdu });
+		partPdu.short_message = {
+			udh: udh,
+			message: messagePart,
+		};
+		pdus.push(partPdu);
+	});
+	return pdus;
+}
+
+// TODO: Add "uselongsms" switch to options;
+async function sendPdu(session, pdu, logger, uselongsms) {
 	return new Promise((resolve, reject) => {
+		if (uselongsms) {
+			const pdus = splitToParts(pdu);
+			logger.info(`Sending long sms of ${pdus.length} parts`);
+			const total = pdus.length;
+			let success = 0;
+			let failed = 0;
+			for (const pdu of pdus) {
 				session.send(pdu, (respPdu) => {
+					if (respPdu.command_status === 0) {
+						success++;
+						if (success + failed === total) {
+							resolve(respPdu);
+						}
+					} else {
+						failed++;
+						if (success + failed === total) {
+							reject(respPdu);
+						}
+					}
+				});
+			}
+		} else {
+			session.send(pdu, (respPdu) => {
+				console.log(respPdu);
 				if (respPdu.command_status === 0) {
 					resolve(respPdu);
 				} else {
 					reject(respPdu);
 				}
 			});
+		}
 	});
 }