All messages are sent using HTTP/1.1 protocol, Post and the URL /EPASSaleToPOI/3.1.
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POST /EPASSaleToPOI/3.1 HTTP/1.1
Accept: */*
Content-type: application/xml; charset=utf-8
Host: 192.168.78.5:11000
Content-Length: 700
Make sure to only send one request at a time. The exception to that rule is AbortRequest, LoginRequest and TransactionStatusRequest, which may be sent when there is an unanswered request ongoing.
A nexo response is received in the Http Response for the request. Http status code is 200 - OK, for any Http Response carrying a nexo Response message. Http status 204 - No Content, is received when there is no nexo message response to a request.
warning: Make sure to wait for the http response long enough. If the socket drops during a PaymentRequest, the terminal is still able to make a transaction but the response cannot be sent. In that perticular case you need to make TransactionStatusRequest.