add mqtt, decouple i2c and sensor

.vscode/settings.json

@@ -42,6 +42,11 @@
         "atomic": "c",
         "__bit_reference": "c",
         "err.h": "c",
-        "httpd.h": "c"
+        "httpd.h": "c",
+        "random": "c",
+        "limits": "c",
+        "tuple": "c",
+        "init.h": "c",
+        "hw_i2c.h": "c"
     }
 }