--- a/sms_main.c	2024-10-08 23:11:01.169908895 +0800
+++ b/sms_main.c	2024-10-08 23:10:52.929909691 +0800
@@ -200,7 +200,12 @@
 	{
 		if(argc < 2)
 			usage();
-	}else if (!strcmp("recv", argv[0]))
+	}
+	else if (!strcmp("send_raw_pdu", argv[0])){
+		if(argc < 2)
+			usage();
+	}
+	else if (!strcmp("recv", argv[0]))
 	{
 	}else if (!strcmp("status", argv[0]))
 	{
@@ -288,6 +293,48 @@
 		fprintf(stderr,"reading port\n");
 	}
 
+	if (!strcmp("send_raw_pdu", argv[0]))
+	{
+		int pdu_len;
+		int pdu_len_except_smsc;
+		char pdustr[1024];
+		
+		alarm(5);
+		pdu_len_except_smsc = strlen(argv[1]) / 2 - 1;
+		sprintf(pdustr, "%s%c\r\n", argv[1],0x1A);
+		sprintf(cmdstr,  "AT+CMGS=%d\r\n", pdu_len_except_smsc);
+		//set to pdu mode
+		fputs("AT+CMGF=0\r\n", pf);
+		while(fgets(buf, sizeof(buf), pfi)) {
+			if(starts_with("OK", buf))
+				break;
+		}
+		fputs(cmdstr, pf);
+		sleep(1);
+		fputs(pdustr, pf);
+
+		errno = 0;
+
+		while(fgets(buf, sizeof(buf), pfi))
+		{
+			if(starts_with("+CMGS:", buf))
+			{
+				printf("sms sent sucessfully: %s", buf + 7);
+				return 0;
+			} else if(starts_with("+CMS ERROR:", buf))
+			{
+				fprintf(stderr,"sms not sent, code: %s\n", buf + 11);
+			} else if(starts_with("ERROR", buf))
+			{
+				fprintf(stderr,"sms not sent, command error\n");
+			} else if(starts_with("OK", buf))
+			{
+				return 0;
+			}
+		}
+		fprintf(stderr,"reading port\n");
+	}
+	
 	if (!strcmp("recv", argv[0]))
 	{
 		alarm(10);