Home automation system using Arduino mega 2560 and VRM-04 wifi module

Projects General Guidance
1

Hi gyzzz i am working on a Home automation project using Arduino MEGA 2560 and VRM-04 wfi shield(HLK-RM04) . So i m having a little trouble linking both devices. i have been connecting
Arduino pins VRM-04(DB9 pins)
RX2 TXD(3)
TX2 RXD(2)
GND GND(5)

From this connection serial monitor is showing "WIFI SHIELD NOT FOUND"
Can u gyzzz plzzz tell me a source code for arduino mega to control 8 relays and a temperature sensor.
I been using this "DOMOTICHOME" app so help me gyzz.
plzz check that the code given below is correct for arduino mega and my project.
Thank YOU
waiting for your Responses

sketch_sep09a.ino (3.4 KB)

2 
String readString = String(30);

This is equivalent to

String readString = "30";

Hard to see how that is a useful initial value.

Arduino pins VRM-04(DB9 pins)

DB9 implies a serial port, with RS232 levels, not TTL levels.

A link to your WiFi module, not a catalog number, would be useful.

#include <mcp9700a.h>

A link to this library is necessary, too.

waiting for your Responses

Get a dictionary. Learn to spell.

3

Plzzzz, enough with the Zs, abbreviations and bad spelling, it hurts my brain interpreting.

Rob