Watch connectivity hangs after locking/unlocking watch

Hi together,

in my app the watch communicates continously with the iPhone via Watch Connectivity. On the simulator enviroment everthings work more or less ok. On the real watch I have the problem that the communication break when the watch is locked (of course, this is ok) but it's still broken when the watch is getting unlocked. I did implement the method for rechability changes (see below)

The method:

- (void)sessionReachabilityDidChange:(WCSession * _Nonnull)session {

    NSLog(@"status changed");

    if (navActive) {
        [self actualizeNavDisplay];
    }
    else {
        [self getInitialNavDisplay];
    }
}

In both methods (actualizeNavDisplay, getInitialNavDisplay I try to send some data which is never received by the iPhone.

   if ([WCSession defaultSession]) {
        WCSession *session = [WCSession defaultSession];
        if (session.reachable) {
            session.delegate = self;
            [session activateSession];
            NSDictionary* infoDict = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObject:@"stopNav"]  forKeys:[NSArray arrayWithObject:@"request"]];
            [[WCSession defaultSession] sendMessage:infoDict
                                       replyHandler:^(NSDictionary *replyHandler) {
                                       }
                                       errorHandler:^(NSError *error) {
                                       }
             ];
        }
    }

Any ideas?

One more question. How to debug on my real, hardware Watch?

Walter