Basic client-side implementation of RFC7967: CoAP No-Response Option

coapthon/client/coap.py

@@ -165,6 +165,13 @@ class CoAP(object):
                 if not self._cb_ignore_write_exception(e, self):
                     raise
 
+        # if you're explicitly setting that you don't want a response, don't wait for it
+        # https://tools.ietf.org/html/rfc7967#section-2.1
+        for opt in message.options:
+            if opt.number == defines.OptionRegistry.NO_RESPONSE.number:
+                if opt.value == 26:
+                    return
+
         if self._receiver_thread is None or not self._receiver_thread.isAlive():
             self._receiver_thread = threading.Thread(target=self.receive_datagram)
             self._receiver_thread.start()

coapthon/client/helperclient.py

@@ -134,7 +134,7 @@ class HelperClient(object):
 
         return self.send_request(request, callback, timeout)
 
-    def post(self, path, payload, callback=None, timeout=None, **kwargs):  # pragma: no cover
+    def post(self, path, payload, callback=None, timeout=None, no_response=False, **kwargs):  # pragma: no cover
         """
         Perform a POST on a certain path.
 
@@ -148,13 +148,17 @@ class HelperClient(object):
         request.token = generate_random_token(2)
         request.payload = payload
 
+        if no_response:
+            request.add_no_response()
+            request.type = defines.Types["NON"]
+
         for k, v in kwargs.items():
             if hasattr(request, k):
                 setattr(request, k, v)
 
-        return self.send_request(request, callback, timeout)
+        return self.send_request(request, callback, timeout, no_response=no_response)
 
-    def put(self, path, payload, callback=None, timeout=None, **kwargs):  # pragma: no cover
+    def put(self, path, payload, callback=None, timeout=None, no_response=False, **kwargs):  # pragma: no cover
         """
         Perform a PUT on a certain path.
 
@@ -168,11 +172,15 @@ class HelperClient(object):
         request.token = generate_random_token(2)
         request.payload = payload
 
+        if no_response:
+            request.add_no_response()
+            request.type = defines.Types["NON"]
+
         for k, v in kwargs.items():
             if hasattr(request, k):
                 setattr(request, k, v)
 
-        return self.send_request(request, callback, timeout)
+        return self.send_request(request, callback, timeout, no_response=no_response)
 
     def discover(self, callback=None, timeout=None, **kwargs):  # pragma: no cover
         """
@@ -190,7 +198,7 @@ class HelperClient(object):
 
         return self.send_request(request, callback, timeout)
 
-    def send_request(self, request, callback=None, timeout=None):  # pragma: no cover
+    def send_request(self, request, callback=None, timeout=None, no_response=False):  # pragma: no cover
         """
         Send a request to the remote server.
 
@@ -204,6 +212,8 @@ class HelperClient(object):
             thread.start()
         else:
             self.protocol.send_message(request)
+            if no_response:
+                return
             try:
                 response = self.queue.get(block=True, timeout=timeout)
             except Empty:

coapthon/defines.py

@@ -127,6 +127,7 @@ class OptionRegistry(object):
     PROXY_URI =     OptionItem(35, "Proxy-Uri",     STRING,  False, None)
     PROXY_SCHEME =  OptionItem(39, "Proxy-Schema",  STRING,  False, None)
     SIZE1 =         OptionItem(60, "Size1",         INTEGER, False, None)
+    NO_RESPONSE =   OptionItem(258, "No-Response",  INTEGER, False, None)
     RM_MESSAGE_SWITCHING = OptionItem(65524, "Routing", OPAQUE, False, None)
 
     LIST = {
@@ -149,6 +150,7 @@ class OptionRegistry(object):
         35: PROXY_URI,
         39: PROXY_SCHEME,
         60: SIZE1,
+        258: NO_RESPONSE,
         65524: RM_MESSAGE_SWITCHING
 
     }

coapthon/messages/request.py

@@ -187,6 +187,16 @@ class Request(Message):
         option.value = None
         self.add_option(option)
 
+    def add_no_response(self):
+        """
+        Add the no-response option to the request
+        # https://tools.ietf.org/html/rfc7967#section-2.1
+        """
+        option = Option()
+        option.number = defines.OptionRegistry.NO_RESPONSE.number
+        option.value = 26
+        self.add_option(option)
+
     @if_none_match.deleter
     def if_none_match(self):
         """