warning: this `MutexGuard` is held across an `await` point
   --> tuic-client/src/connection/mod.rs:148:32
    |
148 |                 let new_conn = ENDPOINT.get().unwrap().lock().connect().await?;
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
note: these are all the `await` points this lock is held through
   --> tuic-client/src/connection/mod.rs:148:73
    |
148 |                 let new_conn = ENDPOINT.get().unwrap().lock().connect().await?;
    |                                                                         ^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock

warning: this `MutexGuard` is held across an `await` point
   --> tuic-client/src/connection/mod.rs:131:13
    |
131 | /             ENDPOINT
132 | |                 .get()
133 | |                 .unwrap()
134 | |                 .lock()
    | |_______________________^
    |
    = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
note: these are all the `await` points this lock is held through
   --> tuic-client/src/connection/mod.rs:136:18
    |
136 |                 .await
    |                  ^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock
    = note: `#[warn(clippy::await_holding_lock)]` on by default

warning: you should consider adding a `Default` implementation for `Heartbeat`
  --> tuic/src/protocol/heartbeat.rs:16:5
   |
16 | /     pub const fn new() -> Self {
17 | |         Self
18 | |     }
   | |_____^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
   = note: `#[warn(clippy::new_without_default)]` on by default
help: try adding this
   |
12 + impl Default for Heartbeat {
13 +     fn default() -> Self {
14 +         Self::new()
15 +     }
16 + }
   |