added btminer get_model and improved return on the rest of the get_models

miners/whatsminer/M21.py

@@ -1,26 +1,9 @@
-from API.btminer import BTMinerAPI
-from miners import BaseMiner
+from miners.btminer import BTMiner
 
 
-class BTMinerM21(BaseMiner):
+class BTMinerM21(BTMiner):
     def __init__(self, ip: str) -> None:
-        api = BTMinerAPI(ip)
-        super().__init__(ip, api)
+        super().__init__(ip)
 
     def __repr__(self) -> str:
         return f"M21 - BTMiner: {str(self.ip)}"
-
-    async def get_hostname(self) -> str:
-        return "BTMiner Unknown"
-
-    async def send_config(self):
-        return None  # ignore for now
-
-    async def restart_backend(self) -> None:
-        return None
-
-    async def reboot(self) -> None:
-        return None
-
-    async def get_config(self) -> None:
-        return None