• client - client Communications The tool is socket The role of the server is just message forwarding . Message records are stored in the local database of the client . Unless your company has a message synchronization function , The server should save , If not necessary, the server is just a simple forwarding role .
• in other words The server doesn't matter what message you send it . The communication protocol is made by you and your Android colleagues . For example, you send an ordinary text message . The definition type is text, Android should be defined like this . To parse your data structure
• The design logic of the client is : Show from database for the first time - send out - Package messages by protocol - receive - Parse the message according to the protocol - Show - Local database backup .
• Real time messages like voice and video . No need to back up . But consider video and audio decompression , Increase the transmission rate
• A -> The server B-> The server … Of course, like friends online , State change, etc , This is pushed by the server . Because everyone is connected to the server . Online and offline servers know . The server will tell you whose status has changed . Offline messages are also A issue B , Server judgment B Not online , So temporary storage . follow-up B After the launch , The server will push the temporary messages to B

• Audio and video can be built by yourself
• Socket-io
• Simple to use , Just build and deliver the video stream by yourself

• Because the company's chat project is just built by itself . Get familiar with
• And the company's chat project is OK . Very successful
• Company chat is used xmpp Written
• Such sensitive data , Or don't give it to a third party
• If the data is encrypted and transmitted, the third party does not know
• If it's just a third party, you have to pay extra for many services if you want to expand them

• If you want to migrate messages, the server should save
• ios There are two ways to migrate . 1.icloud Local backup migration 2. The server saves the migration
• Wechat chat record migration ： Set up - Universal - Backup and migration of chat records

problem ：

1. When wechat chat records are migrated , Is to transmit chat data through LAN , Or transfer through the server