Describe your environment

• Operating system: Linux
• Python Version: 3.8.6
• CCXT version:1.40.99
• Freqtrade Version: 2021.1

Describe the enhancement

Add ping support to the rest_client.py script.

I'm using the rest_client.py script to monitor my freqtrade bot using a custom shell+python script, and it looks like I cannot use the ping command to verify that

目前要kbar必須一次獲取整日kbar資料。是否能在Streaming新增訂閱Kbar onopen onclose events，在開新bar或收bar時收到資料就好，這樣速度比較快，server loading也比較低，謝謝。

It is unclear how to use something like get_token_balance() with respect to the Uniswap v2 factory contract. I am trying to view the amount of a token in the Uniswap v2 liquidity pool, and it seems all I can check is the ERC20 token balance globally.

Edit: I see now I can use get_ex_token_balance(), but I am receiving the Uniswap v1 pool amounts. When I switch to version 2 the Factory methods

Please, add button to copy item name into clipboard.