Send unicode sms with java

Question

I send SMS via GSM device, try this: https://stackoverflow.com/a/31361225/6250402

It can send normal SMS, I try to send a Unicode text but It auto-convert to ASCII: VD¥n ba:#n D_a:?n: TBM01

Lib:

<dependency>
    <groupId>com.neuronrobotics</groupId>
    <artifactId>nrjavaserial</artifactId>
    <version>5.1.1</version>
</dependency>

My code:

CommPortIdentifier portId = "I get CommPort match name";
SerialPort serialPort = portId.open("name", 2000);
serialPort.setSerialPortParams(115200, SerialPort.DATABITS_8, 
        SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
this.outputStream = serialPort.getOutputStream();

// each command function
private void send(String cmd) throws IOException {
    outputStream.write(cmd.getBytes(StandardCharsets.UTF_8)); //
    outputStream.flush();
}

// this sends message method

 send("AT+CMGS=" + '"' + phone + '"' + "\r\n");
 send(message + '\032');

Did I have the wrong config?

Any code to send SMS via GSM for java is a good answer.

Result I missing AT+CSMP=1,167,0,8 (https://stackoverflow.com/a/15312611/6250402, to more info, look https://www.smssolutions.net/tutorials/gsm/sendsmsat/)

you mean `encodeAsUcs2` for `phone` and `mesage` or all `cmd`? — hong4rc, Feb 02 '21 at 09:51
As far as I know, SMS supports GSM-7 (8-bit encoding) and UTF-16 (16-bit encoding; previously UCS-2) only, whereas UTF-8 is a variable character length encoding that cannot be used there. I would start with the message body first, but I didn't work with SMS at that low level, so I can only guess. — terrorrussia-keeps-killing, Feb 02 '21 at 10:11
Hm, I may be wrong, but the whole `cmd` should probably be converted (I mean, what's the point of mixing encodings otherwise?). — terrorrussia-keeps-killing, Feb 02 '21 at 10:18

score 1 · Answer 1 · answered Feb 09 '21 at 12:50

To send unicode text ,first the charset to be selected as UTF-16 (UCS2)

AT+CSCS="UCS2"

After you set AT+CSCS="UCS2" every single string parameter you send must be encoded to UCS2 format ,

You canrefer the blow utilty to enCode to UCS2 http://d-chips.blogspot.com/2012/06/coding-of-alpha-fields-in-sim-for-ucs2.html

pepevalbe · Accepted Answer · 2021-02-09T15:51:40.457

I've an example project of GSM device communication in Java which I run in a raspberry attached to a SIMCom800L module. It uses jSerialComm for serial communications which works nice with no configuration at all. Please take a look to my repo: https://github.com/pepevalbe/sms-gateway

To send Unicode you need to configure your GSM device Character Set. Check possible sets with this command:

AT+CSCS=?
+CSCS: ("GSM","UCS2","IRA","HEX")

If the answer contains "HEX" or "UCS2", Unicode seems to be supported. I tried with UCS2 and it is working nice. Just change the Character Set with: AT+CSCS="UCS2" This will only affect to sms, not regular commands.

Now your device will properly recognize the unicode strings you send from Java. Don't forget to set the sms text mode as well: AT+CMGF=1

I give you a full example based on my repo:

//SIMCom serial port configuration: 115200 bps, 8 bit data, no parity, 1 bit stop, no data stream control
SerialPort serialPort = SerialPort.getCommPort("serial0");
serialPort.setComPortParameters(115200, 8, ONE_STOP_BIT, NO_PARITY);
serialPort.setFlowControl(FLOW_CONTROL_DISABLED);
serialPort.setComPortTimeouts(TIMEOUT_READ_BLOCKING, 3000, 0);
serialPort.openPort();

// Set sms text mode
String textModeCommand = "AT+CMGF=1\r";
serialPort.writeBytes(textModeCommand.getBytes(StandardCharsets.UTF_8), textModeCommand.length());

// Set UCS2 charset
String characterSetCommand = "AT+CSCS=\"UCS2\"\r";
serialPort.writeBytes(characterSetCommand.getBytes(StandardCharsets.UTF_8), characterSetCommand.length());

// Send sms command
String sendTextCommand1 = "AT+CMGS=\"" + number + "\"\n";
String sendTextCommand2 = text + (char) 26 + "\r";
serialPort.writeBytes(sendTextCommand1.getBytes(StandardCharsets.UTF_8), sendTextCommand1.length());
serialPort.writeBytes(sendTextCommand2.getBytes(StandardCharsets.UTF_16), sendTextCommand2.length());

Notice that in the send sms command I encoded the text part using UTF_16 charset, not UTF_8

Call `AT+CSCS=?` and I got `+CSCS: ("GSM","PCCP437","CUSTOM","HEX")`, cannot set `AT+CSCS="UCS2"` — hong4rc, Feb 18 '21 at 10:15
Go for HEX then. You need to encode the text string as hexadecimal. Check this out: https://www.smssolutions.net/tutorials/gsm/sendsmsat/ — pepevalbe, Feb 18 '21 at 10:30
I think I have the wrong config or something, I sent `06450631062D06280627 ` like your example but got `ùEù1ù-ù(ù'` instead of `مرحبا` — hong4rc, Feb 18 '21 at 10:39

score 0 · Answer 3 · answered Feb 09 '21 at 12:31

Following are the reasons need to be check in sending/receiving unicoded text

Make sure your reading the input in UTF-8 format, create InputstreamReader constructor with UTF-8 encoding

InputStream inputStream = new FileInputStream("data.txt");

InputStreamReader inputStreamReader =  new InputStreamReader(inputStream, Charset.forName("UTF-8"));

For more references : https://docs.oracle.com/javase/tutorial/i18n/text/stream.html

Use bytemessage methods instead of text message for sending/receiving unicode text

https://docs.oracle.com/javaee/7/api/javax/jms/BytesMessage.html

Send unicode sms with java

3 Answers3