implemented credential config via WifiManager

src/IRbabyIRIS.h

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright (c) 2020-2021 IRbaby-IRext
+ * Copyright (c) 2020-2022 IRbaby-IRext
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,6 +24,8 @@
 #ifndef IRBABY_IRIS_H
 #define IRBABY_IRIS_H
 
+#define CREDENTIAL_MAX   (40)
+
 int getIRISKitVersion(char *buffer, int buffer_size);
 
 int getDeviceID(char* buffer, int buffer_size);