RSSI status added (found as part of Negotiate Channel Response from Pump)

Shows user percentage feedback of radio signal to help them diagnose reception issues.

RSSI (Recieved Signal Strength Indicator) is a common name for the signal strength in a wireless network environment. It is a measure of the power level that a RF client device is receiving from an access point, for example.

app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlReader.java

@@ -150,9 +150,11 @@ public class MedtronicCnlReader {
             ChannelNegotiateResponseMessage response = new ChannelNegotiateRequestMessage(mPumpSession).send(mDevice);
 
             if (response.getRadioChannel() == mPumpSession.getRadioChannel()) {
+                mPumpSession.setRadioRSSI(response.getRadioRSSI());
                 break;
             } else {
                 mPumpSession.setRadioChannel((byte)0);
+                mPumpSession.setRadioRSSI((byte)0);
             }
         }
 

app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlSession.java

@@ -20,6 +20,8 @@ public class MedtronicCnlSession {
     private long pumpMAC;
 
     private byte radioChannel;
+    private byte radioRSSI;
+
     private int bayerSequenceNumber = 1;
     private int medtronicSequenceNumber = 1;
 
@@ -80,6 +82,14 @@ public class MedtronicCnlSession {
         return radioChannel;
     }
 
+    public byte getRadioRSSI() {
+        return radioRSSI;
+    }
+
+    public int getRadioRSSIpercentage() {
+        return (((int) radioRSSI & 0x00FF) * 100) / 0xA8;
+    }
+
     public void incrBayerSequenceNumber() {
         bayerSequenceNumber++;
     }
@@ -92,6 +102,10 @@ public class MedtronicCnlSession {
         this.radioChannel = radioChannel;
     }
 
+    public void setRadioRSSI(byte radioRSSI) {
+        this.radioRSSI = radioRSSI;
+    }
+
     public void setHMAC(byte[] hmac) {
         this.HMAC = hmac;
     }

app/src/main/java/info/nightscout/android/medtronic/message/ChannelNegotiateResponseMessage.java

@@ -16,6 +16,7 @@ public class ChannelNegotiateResponseMessage extends ContourNextLinkBinaryRespon
     private static final String TAG = ChannelNegotiateResponseMessage.class.getSimpleName();
 
     private byte radioChannel = 0;
+    private byte radioRSSI = 0;
 
     protected ChannelNegotiateResponseMessage(MedtronicCnlSession pumpSession, byte[] payload) throws EncryptionException, ChecksumException, IOException {
         super(payload);
@@ -25,15 +26,21 @@ public class ChannelNegotiateResponseMessage extends ContourNextLinkBinaryRespon
         Log.d(TAG, "negotiateChannel: Check response length");
         if (responseBytes.length > 46) {
             radioChannel = responseBytes[76];
+            radioRSSI = responseBytes[59];
             if (responseBytes[76] != pumpSession.getRadioChannel()) {
                 throw new IOException(String.format(Locale.getDefault(), "Expected to get a message for channel %d. Got %d", pumpSession.getRadioChannel(), responseBytes[76]));
             }
         } else {
             radioChannel = ((byte) 0);
+            radioRSSI = ((byte) 0);
         }
     }
 
     public byte getRadioChannel() {
         return radioChannel;
     }
+
+    public byte getRadioRSSI() {
+        return radioRSSI;
+    }
 }

app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCnlIntentService.java

@@ -213,7 +213,8 @@ public class MedtronicCnlIntentService extends IntentService {
                 } else {
                     setActivePumpMac(pumpMAC);
                     activePump.setLastRadioChannel(radioChannel);
-                    sendStatus(String.format(Locale.getDefault(), "Connected to Contour Next Link on channel %d.", (int) radioChannel));
+                    //sendStatus(String.format(Locale.getDefault(), "Connected to Contour Next Link on channel %d.", (int) radioChannel));
+                    sendStatus(String.format(Locale.getDefault(), "Connected on channel %d  RSSI: %d%%", (int) radioChannel, cnlReader.getPumpSession().getRadioRSSIpercentage()));
                     Log.d(TAG, String.format("Connected to Contour Next Link on channel %d.", (int) radioChannel));
                     cnlReader.beginEHSMSession();