Delete unused opc server function

Author: azelcs

README.md

@@ -143,7 +143,7 @@ pry> client = OPCUAClient::Client.new
 pry> client.connect("opc.tcp://127.0.0.1:4840")
 pry> client.read_uint32(5, "uint32b")
 pry> client.read_uint16(5, "uint16b")
-pry> client.read_bool(5, "bool_true")
+pry> client.read_bool(5, "bool_a")
 ```
 
 ### Test it

tools/server/opcua-test-server

@@ -75,10 +75,6 @@ static void addVariableV2(UA_Server *server, UA_Int16 nsId, int type, const char
     UA_NodeId parentNode = addVariable(server, nsId, type, desc, displayName, nodeId, varName, defaultValue);
 }
 
-static void addVariableStr(UA_Server *server, UA_Int16 nsId, int type, const char *variable, UA_String defaultValue = UA_STRING("")) {
-    addVariableV2(server, nsId, type, variable, &defaultValue);
-}
-
 UA_Boolean running = true;
 static void signalHandler(int signum) {
     UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_SERVER, "Signal received: %i", signum);