Project name: Webrequest Kill Switch 1.0

Aim: The end user will have the ability to close all open trades or toggle the autotrading button from an external url

Platform:  MT4

Summary:   There are two sub projects within this project:
(i) Creation of a web form on an external url, 
(ii) Expert advisor script which calls the Webrequest function to interact with 
(i)


Prerequisites:   

(i) Understanding of the webrequest function https://www.mql5.com/en/docs/network/webrequest
(ii) Knowledge of how to implement http requests and interact with external url
(iii) Ability to create a web form with buttons and fields
(iv) Access to some web space for development purposes


Expert Advisor functionality

An expert advisor script will be required which is attached to a new metatrader 4 chart on the same terminal.  For example, if a user has an EA running on XAU USD m1 chart, then another chart will  opened in order to run the new killswitch script 

Expert advisor setting suggestions:   
Magic number 
Account number:   
Close all trades function Yes/No
Autotrade function Yes/No

The script requires the external url to be added to the options section of the Mt4 terminal 

The script uses the webrequest function to call the external url to check whether the url has issued an autotrade toggle on/off.    When the message s received, the expert advisor will toggle the autotrade button on the MT4 terminal

The script uses the webrequest function to call the external url to check whether the url has issued a close all trades request. When the message is received, the expert advisor will close all open trades on the other chart 

Is the script able to send the url a message whether the autotrading is currently ON or OFF ?




External  url functionality 


The external url is a web page .  The web page requires a web form with the following fields/buttons


Field 1:   Account number
Field 2:  Magic number

Status field:  Autotrade status:   On/off

Button 1 : Toggle autotrade
Button 2: Close all trades


The web form sends these messages to the Expert advisor via the webrequest function .    This is a similar method of interaction that news filter EAs  use to turn off autotrade during news events.

Status messaging:   

The web form should confirm that an autotrade command has been executed successfully 

The web form should confirm that the close all trades has been executed successfully