C# design SGIP program

If it is developed according to SGIP protocol of China Unicom, it is based on SOCKET.

If you want to be simple, the amount of short messages is not too large, you can use API to develop.

I also tortured for a long time a few years ago, and there was little information.

It is recommended to find Huawei's SMS API, which is available in all four gateways, and the documentation is good! But it is said that the efficiency is not very high. See where you use it!