更新mixiot库，支持图片编码

boards/default_src/micropython/origin/build/lib/mixiot.py

@@ -30,6 +30,15 @@ def wlan_connect(ssid='MYSSID', password='MYPASS', timeout=10):
     print('\nnetwork config:', wlan.ifconfig())
     return wlan
 
+def image_base64(path="mixly.jpg"):
+    from base64 import b64encode
+    if isinstance(path, str):
+        with open(path, 'rb') as f:
+            _data = f.read()
+            return 'data:image/{};base64,'.format(path.split('.')[-1]).encode() + b64encode(_data)
+    else:
+        return b'data:image/jpg;base64,' + b64encode(path)
+
 def ntp(url='mixio.mixly.cn'):
     import urequests
     try: