add

README.md

@@ -135,10 +135,10 @@ DeviceInfo包括如下信息：
 
 ---
 <a name="set_rrpc_callback"></a>
-### SubDevice.set_rrpc_callback(msg_callback)
+### SubDevice.set_rrpc_callback(msg_callback)->bytes
 设置子设备的接收RRPC的回调函数
 
-* set_RRPC_callback`func`: 子设备收消息回调，例如：` def callbacl(topic:str, msg:b''): print(str(msg,'utf-8')`
+* set_RRPC_callback`func`: 子设备收消息回调，例如：` def callback(topic:str, msg:b''): return b 'hello'`
 
 
 ---

iotedgedriverlinksdk/client.py

@@ -38,8 +38,8 @@ class SubDevice(object):
     def set_msg_callback(self, msg_callback):
         self.callback = msg_callback
 
-    def set_rrpc_callback(self, msg_callback):
-        self.rrpc = msg_callback
+    def set_rrpc_callback(self, rrpc_callback):
+        self.rrpc = rrpc_callback
 
     def get_device_info(self):
         return {

iotedgedriverlinksdk/edge.py

@@ -398,7 +398,11 @@ def _on_message(message):
             sub_dev = _connect_map[identify]
             if isinstance(topic, str) and topic.startswith("/$system/") and topic.find("/rrpc/request/") > 0:
                 if sub_dev.rrpc:
-                    sub_dev.rrpc(topic, msg)
+                    resp = sub_dev.rrpc(topic, msg)
+                    if not resp:
+                        topic = topic.replace(
+                            "/rrpc/request/", "/rrpc/response/", 1)
+                        sub_dev.publish(topic, resp)
 
             if sub_dev.callback:
                 sub_dev.callback(topic, msg)