External Captive Portal is inquiring about communication settings

I want to make and use an external cpative portal in an environment where omniista 2500 is installed, but I think it is possible to make an external cpative portal only when there is data on how to communicate

1.I would like to inquire about the type and meaning of the entire redirect parameter.
(ARUBA example) https://arubanetworking.hpe.com/techdocs/central/2.5.7/content/nms/nwk-services/conf-ext-cp-parameters.htm

  1. I would like to ask you how to set up the AP and the external Captive Portal to communicate.
    (CISCO example) https://github.com/stuartst/cisco-wlc-captive-portal/blob/master/README.md

CISCO has set that information in switch_url so that you can set up an AP from an external Captive Portal.

I need a developer guide for third-party external Captive Portal interworking.

You can look into the article Implementation Guide

Under the topic OmniAccess Stellar guest captive portal
authentication with CPPM and UPAM as a
proxy. I hope it should help if not let me know I will try to see to provide more information

You can check out the external captive portal implementation for developer at GitHub - Samuelyip74/StellarExternalCP: Python Code for Alcatel-Lucent External Captive Portal

This example is meant for OmniAccess Stellar AP + External Captive Portal. You will need to configure the AP to send radius packets to external AAA server (i.e. FreeRadius).