Add files via upload

Author: nefelimet

Modem$terminal.class

@@ -0,0 +1,108 @@
+import java.io.File;  // Import the File class
+import java.io.FileWriter;   // Import the FileWriter class
+import java.io.IOException;  // Import the IOException class to handle errors
+
+public class userApp {
+
+	public static String echoRequestCode =  "E1092";
+	public static String imageRequestCode = "M2490";
+	public static String imageRequestCodeError = "G0342";
+	public static String gpsRequestCode = "P4642";
+	public static String ackCode = "Q2289";
+	public static String nackCode = "R8766";
+
+	public static void main(String[] param) {
+		(new userApp()).demo();
+	}
+
+	public Modem initModem(int speed, int timeout){
+		Modem modem;
+		modem=new Modem();
+		modem.setSpeed(speed);
+		modem.setTimeout(timeout);
+		modem.open("ithaki");
+		return modem;
+	}
+
+	public void listen(Modem modem, String delimiter){
+		int k;
+		String rxmessage ="";
+		System.out.println("Sent request for message.");
+
+		//Endless loop for listening for message
+		for (;;) {
+			try {
+				k=modem.read();																													//Read a byte from the modem
+				if (k==-1){
+					System.out.println("Connection closed.");
+					break;
+				}
+				//System.out.println((char)k);
+				//System.out.print((char)k+" <"+k+"> ");
+				rxmessage = rxmessage + (char)k;
+				//System.out.println(rxmessage);
+				//Break endless loop by catching break sequence.
+				if (rxmessage.indexOf(delimiter)>-1){																		//If the break sequence is found break
+					System.out.println(rxmessage);
+					System.out.println("End of listen message.");
+					break;
+				}
+			} catch (Exception x) {
+				break;
+			}
+		}
+	}
+
+	public void sendAndListen(Modem modem, String txmessage, String delimiter){
+		int k;
+		String rxmessage = "";
+		//We create a different variable for the message we will send to Ithaki. The reason for differentiating is because for some reason the terminal couldn't print the
+		//txmessage if we sent it along with the txmessage.
+		String txmessageToSend = txmessage + "\r";
+		modem.write(txmessageToSend.getBytes());
+		String toPrint = "Sent " + txmessage + " request code.";
+		System.out.println(toPrint);
+		listen(modem, delimiter);
+	}
+
+	public void demo() {
+		//Initialize modem
+		Modem modem = initModem(1000, 2000);
+
+		//Listen for welcome message
+		listen(modem, "\r\n\n\n");
+
+		//Send a test message and listen for answer
+		sendAndListen(modem, "test", "PSTOP\r\n");
+
+		//Create text file to store echo messages
+		try {
+			File myObj = new File("echopackets.txt");
+      if (myObj.createNewFile()) {
+      	System.out.println("File created: " + myObj.getName());
+      } else {
+        System.out.println("File already exists.");
+      }
+    } catch (IOException e) {
+      System.out.println("An error occurred.");
+      e.printStackTrace();
+    }
+		//Send echoRequestCodes and listen for answers
+		for(int i =0; i<2; i++){
+			sendAndListen(modem, echoRequestCode, "PSTOP");
+			try {
+      	FileWriter myWriter = new FileWriter("echopackets.txt");
+      	myWriter.write("Written "+i+"th line.\r");
+      	myWriter.close();
+      	System.out.println("Successfully wrote to the file.");
+    	} catch (IOException e) {
+      	System.out.println("An error occurred.");
+      	e.printStackTrace();
+    	}
+		}
+
+		// NOTE : Stop program execution when "NO CARRIER" is detected.
+		// NOTE : A time-out option will enhance program behavior.
+		modem.close();
+	}
+}