Fixing modem tests

Author: kotl

contrib/src/modem/db/stream-command.cpp

@@ -32,7 +32,7 @@ bool StreamCommand::execute(const String& command,
       out->print(FirebaseStream::EventToName(event).c_str());
       out->print(" ");
       const auto& object = buffer.parseObject(json.c_str());
-      String data = object["data"];
+      String data = object["data"].asString();
       out->println(object["path"].asString());
       out->println(data.length());
       out->println(data);

contrib/test/modem/WString.h

@@ -0,0 +1,3 @@
+#include <string>
+
+typedef std::string String;

src/Firebase.h

@@ -20,6 +20,7 @@
 #ifndef firebase_h
 #define firebase_h
 
+#include "WString.h"
 #include <Arduino.h>
 #include <memory>
 #include <ArduinoJson.h>