Attempt to remedy PowerBroker2#220 when 0100 command returns more dat…

…a than can be handled

src/ELMduino.cpp

@@ -117,13 +117,20 @@ bool ELM327::initializeELM(const char &protocol, const byte &dataTimeout)
                 // the timeout value to 30 seconds, then restore the previous value.
                 uint16_t prevTimeout = timeout_ms;
                 timeout_ms = 30000;
+
+                int8_t state = sendCommand_Blocking("0100");
 
-                if (sendCommand_Blocking("0100") == ELM_SUCCESS)
+                if (state == ELM_SUCCESS)
                 {
                     timeout_ms = prevTimeout;
                     connected = true;
                     return connected;
                 }
+                else if (state == ELM_BUFFER_OVERFLOW)
+                {
+                    while (elm_port->available())
+                        elm_port->read();
+                }
 
                 timeout_ms = prevTimeout;
             }