added this part to solve ConnectionError: Cannot send requests while disconnected

Scheduling-Functions.md

@@ -29,7 +29,7 @@ foo_cb()
 
 This schedules itself again when it runs, so it is always running. It runs, 10 minutes pass, it schedules itself again, and repeat. This is similar to JavaScript's [`setTimeout`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout).
 
-> **Important note**. Do **not** call the synchronous function when you schedule it, or it will recurse forever. `loop.call_later(delay, func())` won't work, but `loop.call_later(delay, func)` will.
+**Important note**. Do **not** call the synchronous function when you schedule it, or it will recurse forever. `loop.call_later(delay, func())` won't work, but `loop.call_later(delay, func)` will.
 
 You can also use `while` loops:
 
@@ -54,6 +54,15 @@ or:
 loop.run_forever()
 ```
 
+Also if you encounter this error `ConnectionError: Cannot send requests while disconnected` that means you first need to start the client `client.start()` then call `foo_cb()`:
+
+```python
+client.start()
+
+foo_cb()
+
+client.run_until_disconnected()
+```
 ---
 
 If you don't mind using other libraries, [`aiocron`](https://github.com/gawel/aiocron) is a good option. See https://crontab.guru/ to learn its time syntax.