private static long secondsTill(@NonNull final Date retryDateSuggestion) {
        return TimeUnit.MILLISECONDS.toSeconds(retryDateSuggestion.getTime() - System.currentTimeMillis());
    }
Show toast with error message appropriate to exception reason.

@param context   current Activity context
@param exception BleScanException to show error message for
sample/src/main/java/com/polidea/rxandroidble2/sample/util/ScanExceptionHandler.java