list known player in invite info where known

(for mqtt only)

xwords4/android/app/src/main/java/org/eehouse/android/xw4/DBUtils.java

@@ -603,6 +603,15 @@ public class DBUtils {
                         msg = LocUtils.getString( context, R.string.invit_expl_relay_fmt,
                                                   timestamp );
                         break;
+                    case MQTT:
+                        String player = XwJNI.kplr_nameForMqttDev( target );
+                        if ( null != player ) {
+                            msg = LocUtils.getString( context,
+                                                      R.string.invit_expl_player_fmt,
+                                                      player, timestamp );
+                            break;
+                        }
+                        // else FALLTHRU
                     default:
                         msg = LocUtils.getString( context, R.string.invit_expl_notarget_fmt,
                                                   means.toString(), timestamp );

xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/XwJNI.java

@@ -204,6 +204,13 @@ public class XwJNI {
             : null;
     }
 
+    public static String kplr_nameForMqttDev( String mqttID )
+    {
+        return BuildConfig.HAVE_KNOWN_PLAYERS
+            ? kplr_nameForMqttDev( getJNI().m_ptrGlobals, mqttID )
+            : null;
+    }
+
     private static void cleanGlobals()
     {
         synchronized( XwJNI.class ) { // let's be safe here
@@ -724,6 +731,7 @@ public class XwJNI {
                                                      String newName );
     private static native void kplr_deletePlayer( long jniState, String player );
     private static native CommsAddrRec kplr_getAddr( long jniState, String name );
+    public static native String kplr_nameForMqttDev( long jniState, String mqttID );
 
     private static native void cleanGlobals( long jniState );
     private static native byte[] gi_to_stream( long jniState, CurGameInfo gi );

xwords4/android/jni/xwjni.c

@@ -833,6 +833,20 @@ Java_org_eehouse_android_xw4_jni_XwJNI_kplr_1getAddr
     DVC_HEADER_END();
     return jaddr;
 }
+
+JNIEXPORT jstring JNICALL
+Java_org_eehouse_android_xw4_jni_XwJNI_kplr_1nameForMqttDev
+( JNIEnv* env, jclass C, jlong jniGlobalPtr, jstring jDevID )
+{
+    jstring result = NULL;
+    DVC_HEADER(jniGlobalPtr);
+    const char* devid = (*env)->GetStringUTFChars( env, jDevID, NULL );
+    const XP_UCHAR* name = kplr_nameForMqttDev( globalState->dutil, env, devid );
+    result = (*env)->NewStringUTF( env, name );
+    (*env)->ReleaseStringUTFChars( env, jDevID, devid );
+    DVC_HEADER_END();
+    return result;
+}
 #endif
 
 JNIEXPORT jbyteArray JNICALL

xwords4/common/knownplyr.c

@@ -292,6 +292,27 @@ kplr_getAddr( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* name,
     return found;
 }
 
+const XP_UCHAR*
+kplr_nameForMqttDev( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* mqttDevID )
+{
+    const XP_UCHAR* name = NULL;
+    MQTTDevID devID;
+    if ( strToMQTTCDevID( mqttDevID, &devID ) ) {
+        KPState* state = loadState( dutil, xwe );
+        for ( KnownPlayer* kp = state->players; !!kp && !name; kp = kp->next ) {
+            const CommsAddrRec* addr = &kp->addr;
+            if ( addr_hasType( addr, COMMS_CONN_MQTT ) ) {
+                if ( 0 == XP_MEMCMP( &addr->u.mqtt.devID, &devID, sizeof(devID) ) ) {
+                    name = kp->name;
+                }
+            }
+        }
+        releaseState( dutil, xwe, state );
+    }
+    LOG_RETURNF( "%s", name );
+    return name;
+}
+
 static void
 freeKP( XW_DUtilCtxt* dutil, KnownPlayer* kp )
 {

xwords4/common/knownplyr.h

@@ -43,6 +43,9 @@ void kplr_getNames( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR** players,
                     XP_U16* nFound );
 XP_Bool kplr_getAddr( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* name,
                       CommsAddrRec* addr );
+const XP_UCHAR* kplr_nameForMqttDev( XW_DUtilCtxt* dutil, XWEnv xwe,
+                                     const XP_UCHAR* mqttDevID );
+
 KP_Rslt kplr_renamePlayer( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* oldName,
                            const XP_UCHAR* newName );
 KP_Rslt kplr_deletePlayer( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* name );