1. Rename set_variable, get_variable-> send_variable, recv_variable: https://github.com/CoLearn-Dev/colink-sdk-rust-dev/pull/55
2. Add generate_token_with_signature; add test_user_management: https://github.com/CoLearn-Dev/colink-sdk-rust-dev/pull/41
3. Instant server error redirect, check mq connection before start: https://github.com/CoLearn-Dev/colink-sdk-rust-dev/pull/40
4. Fix instant server version: https://github.com/CoLearn-Dev/colink-sdk-rust-dev/pull/51