App 2.27.3: read the cruise control target speed, log it raw

The head unit names a vendor float AAD_EPTCCTRGTSPD (0x2160A15B),
the cruise control target speed by its name. EVHardware reads it raw;
the Logs tab lists each change with time, speed and gear, to establish
the unit and the off value on the car. Emulator only (absent there).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/build.gradle

@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 123
-        versionName "2.27.2"
+        versionCode 124
+        versionName "2.27.3"
 
         // Nothing about the server ships in the APK: its URL and ingest token are entered in
         // the app's Server tab (ServerConfig), and the database is only reachable by the server.

app/src/main/java/com/evsuite/abrp/CruiseLog.java

@@ -0,0 +1,69 @@
+package com.evsuite.abrp;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Every change of the cruise control target speed the car reports (`0x2160A15B`, raw, unit not
+ * established) with the time, speed and gear, the last {@link #MAX_LINES}, shown on the Logs
+ * tab. It is how the value gets matched to what the cluster shows: set the cruise control, change
+ * the speed, switch it off, and read what the car reported. Kept in preferences; a line is
+ * written only when the value (to 0.1) changes.
+ */
+final class CruiseLog {
+
+    static final int MAX_LINES = 12;
+    private static final String PREFS = "cruise_log";
+    private static final String KEY = "lines";
+
+    /** The last value seen in this process, as text ("unread" when null); null before the first. */
+    private static String last;
+
+    private CruiseLog() {}
+
+    /** The value as the log writes it: one decimal, or "unread". */
+    static String format(Float raw) {
+        return raw == null || !Float.isFinite(raw) ? "unread" : String.format(Locale.US, "%.1f", raw);
+    }
+
+    /** Called with every reading; records a line when the value differs from the last one. */
+    static void note(Context context, Float raw, Float speedKmh, Integer gear) {
+        String value = format(raw);
+        synchronized (CruiseLog.class) {
+            if (context == null || value.equals(last)) return;
+            last = value;
+            String line = new SimpleDateFormat("dd.MM. HH:mm:ss", Locale.US).format(new Date())
+                    + "  target " + value
+                    + "  at " + (speedKmh == null ? "—" : String.format(Locale.US, "%.0f km/h", speedKmh))
+                    + "  gear " + (Gear.label(gear).isEmpty() ? "?" : Gear.label(gear));
+            SharedPreferences prefs = context.getApplicationContext()
+                    .getSharedPreferences(PREFS, Context.MODE_PRIVATE);
+            List<String> lines = UpdateLog.append(split(prefs.getString(KEY, null)), line, MAX_LINES);
+            prefs.edit().putString(KEY, String.join("\n", lines)).apply();
+        }
+    }
+
+    /** The value now as text, "—" before the first reading. */
+    static synchronized String current() {
+        return last == null ? "—" : last;
+    }
+
+    /** Newest first. */
+    static List<String> lines(Context context) {
+        SharedPreferences prefs = context.getApplicationContext()
+                .getSharedPreferences(PREFS, Context.MODE_PRIVATE);
+        return split(prefs.getString(KEY, null));
+    }
+
+    private static List<String> split(String stored) {
+        if (stored == null || stored.isEmpty()) return new ArrayList<>();
+        return new ArrayList<>(Arrays.asList(stored.split("\n")));
+    }
+}

app/src/main/java/com/evsuite/abrp/MainActivity.java

@@ -1731,6 +1731,7 @@ public class MainActivity extends AppCompatActivity {
             vehTireFr.setText(unit.format(s.getTirePressures().getFrontRightKpa()));
             vehTireRl.setText(unit.format(s.getTirePressures().getRearLeftKpa()));
             vehTireRr.setText(unit.format(s.getTirePressures().getRearRightKpa()));
+            CruiseLog.note(this, s.getCruiseTargetSpeedRaw(), s.getSpeedKmh(), s.getGearRaw());
             showGauges(s);
             showCockpit(s);
             showDrawnStyles(s);
@@ -2056,6 +2057,13 @@ public class MainActivity extends AppCompatActivity {
         // Update steps first: after a failed install, they are what the driver came here for.
         java.util.List<String> updates = UpdateLog.lines(this);
         StringBuilder sb = new StringBuilder();
+        // The cruise control target speed as the car reports it, to match it on the car.
+        java.util.List<String> cruise = CruiseLog.lines(this);
+        if (!cruise.isEmpty()) {
+            sb.append(getString(R.string.cruise_log_title, CruiseLog.current()));
+            for (String line : cruise) sb.append('\n').append(line);
+            sb.append("\n\n");
+        }
         if (!updates.isEmpty()) {
             sb.append(getString(R.string.update_log_title));
             for (String line : updates) sb.append('\n').append(line);

app/src/main/res/values/strings.xml

@@ -198,6 +198,7 @@
     <string name="label_call_log">Recent uploads</string>
     <string name="call_log_empty">No upload attempted yet.</string>
     <string name="update_log_title">Updates, newest first:</string>
+    <string name="cruise_log_title">Cruise control target speed, newest first (now: %1$s; raw, unit not known yet):</string>
     <string name="btn_flush_now">Upload now</string>
     <string name="status_starting">Starting…</string>
     <string name="status_running_no_upload">Running — waiting for first upload</string>

app/src/test/java/com/evsuite/abrp/CruiseLogTest.java

@@ -0,0 +1,18 @@
+package com.evsuite.abrp;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+/** The cruise control log's value format — pure JVM. */
+public class CruiseLogTest {
+
+    @Test
+    public void oneDecimalOrUnread() {
+        assertEquals("120.0", CruiseLog.format(120f));
+        assertEquals("33.3", CruiseLog.format(33.33f));
+        assertEquals("0.0", CruiseLog.format(0f));
+        assertEquals("unread", CruiseLog.format(null));
+        assertEquals("unread", CruiseLog.format(Float.NaN));
+    }
+}