Implement callbacks with register_device_request

About this task

In the C Library integration, some callbacks are part of, and passed with, a register_device_request.

This includes:

ped_state_change_CB
tender_additional_data_CB
tender_print_receipt_CB
tender_check_signature_CB
tender_progress_CB
tender_dcc_CB
tender_finished_CB
tender_referral_CB

This does not apply to callbacks that are not added to the register_device_request structure. For these callbacks, see Implement callbacks.

We have defined a signature for each callback in the register_device_extern.h file. The signature we provide looks like:

void tender_print_receipt_CB(receipts_strct * , ped_device_info * , void * );

You will need to implement callback functions with the same signature.

Steps

To use these callbacks:

Implement the callback. In the following example we will implement the print_receipt callback.

void tender_print_receipt_CB(receipts_strct * status_tender, ped_device_info * ped_state, void * echo_struct){

    app_context_t * sPOS = (app_context_t *)echo_struct;

    //TODO: store the receipts somewhere

    //ADYLibraryResult result =

    confirm_print_receipt(sPOS->terminal_id, sPOS->tender_reference, true);

}

Assign a pointer for print_receipt_callback to status_tender_print_receipt in the callbacks data structure within the register_device_request
```
register_device_request_ptr->callbacks.status_tender_print_receipt   = tender_print_receipt_CB;
```
When you have populated register_device_request.callbacks with each callback, pass register_device_request as a parameter of the register_device call.
```
ADYLibraryResult result = register_device(register_device_request_ptr, register_ped_CB, sPOS);
```