13
votes
Accepted
Is CoAP still used for IoT devices?
The reason that you find few implementations is most likely because CoAP is a relatively young protocol. It was first proposed in 2010, and the current version dates from 2014: RFC 7252.
For ...
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12
votes
Are there any devices with open-source protocols over Wi-Fi?
The IKEA Trådfri lighting system is all CoAP based, you can find my write up on the protocol here
Belkin WeMo devices are all uPnP and SOAP controlled as well so another open/self describing protocol
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8
votes
Accepted
Does CoAP depend on IEEE 802.15.4?
No, CoAP is an application layer protocol it's not dependent
Basically that's the beauty behind the OSI layers. If correctly implemented you can mostly stack them however you want. As with every ...
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7
votes
Accepted
Usage of Constrained Application Protocol (CoAP) in eastern european countries/russia and china
I'm not sure, if this is a answer or should be a comment, but though I don't have enough reputation to comment ...
End of last year there have been some news about the (mis?) usage of CoAP.
Message ...
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7
votes
Accepted
Does CoAP have a lower footprint than MQTT?
CoAP and MQTT have both equal RAM usage, measured in 10kbits [1].
Difference is in cpu and network usage: [2]
Every client supports TCP and holds a connection open to the broker.
So, CoAP has ...
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5
votes
What is the library to be used to implement CoAP in ESP8266?
There are no standards only RFCs for CoAP; all of them are accessible on the web:
RFC 7228 - Terminology for Constrained-Node Networks, May 2014
RFC 7252 - The Constrained Application Protocol (CoAP),...
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5
votes
Non-IP device Communication Protocols
The protocols you mentioned are application layer protocols and they run over TCP or UPD, you can not use an application layer without IP.
But you can use an implementation of MQTT for Sensors called ...
- 241
4
votes
Usage of Constrained Application Protocol (CoAP) in eastern european countries/russia and china
In addition to Achim's comment (and with the same uncertainty as to whether that'd be an answer or a comment), you may want to consider the following:
A single installation rolling out, MQTT, would ...
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4
votes
How to convert messages between CoAP and MQTT protocols?
You would need a 'gateway' that can translate from CoAP to MQTT (and vice versa). Various examples exist, such as:
emq-coap which allows CoAP clients to communicate with an instance of the EMQ MQTT ...
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2
votes
Does CoAP have a lower footprint than MQTT?
One of the answers above says that CoAP uses UDP and hence does not guarantee data delivery. This is not completely true. CoAP has a non-confirmed mode and a confirmed mode of sending messages.
In ...
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1
vote
LWM2M Bootstrap Factory versus Client
I am no further forward on this part of the question "Questions re Factory Bootstrap"
But answer to this "questions re Client Initiated Bootstrap" can be found here I think.
Why ...
- 151
1
vote
Scalability: CoAP vs. MQTT-SN
I don't think, there is a easy answer, nor a fair one.
One aspect of scaling maybe the distinguish between "hot" and "cold" data (say "hot" you must always fetch from the single fresh source (hardly ...
- 246
1
vote
CoAP protocol using californium java library
Californium is designed to process many request simultaneously. Therefore it uses callbacks (CoapResource).
May be I missunderstood your intention of the question. For me "all in main" sounds as an ...
- 246
1
vote
What is the library to be used to implement CoAP in ESP8266?
I think you were looking for this. I use this library for my arduino projects on a Wemos esp8266 based board.
https://github.com/automote/ESP-CoAP
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Only top scored, non community-wiki answers of a minimum length are eligible