Re: [boost] Proposal for yet another MQTT library for Boost

Hi Klemens, Joaquin Thanks you for the feedbacks: https://github.com/redboltz/async_mqtt/blob/main/example/ep_cpp20coro_mqtt_c... This is the code that demonstrates simple MQTT client using async_mqtt with C++20 corutine. Underlying parts (name resolution, TCP, TLS, WS handshaking) are intentionally exclude from async_mqtt. Because users might want to customize the layers. It is similar as Boost.Beast design https://github.com/boostorg/beast/blob/develop/example/websocket/client/coro... I think that sending MQTT packet is simple too. However, I think that it is not a big difference. The biggest difference between async-mqtt5 and async_mqtt is the meaning of CompletionHandler. I guess that Klemens pointed is that. Am I understanding correctly? async_mqtt send() function's CompletionHandler is invoked when the underlying async_write is completed. async-mqtt5 sending functions (async_subscribe, async_unsubscribe, and async_publish) CompletionHandler is invoked the corresponding acknolege MQTT packet (SUBACK, UNSUBACK, PUBACK, PUBCOMP) is received. async_mqtt recv() function's CompletionHandler is invoked when any MQTT packet is receied, in addition when connection error is happened. async-mqtt5 async_receive() function's CompletionHandler is invoked when MQTT PUBLISH packet is received. As Klemens pointed out, async-mqtt5 easier to use than async_mqtt for casual usecases thanks to its higher level APIs. I guess that the high level APIs can be implemented on async_mqtt's comparatively low level APIs.I will consider what is the good abstraction for higher level APIs, based on your feedback. Thanks, Takatoshi Kondo 2024年4月30日(火) 2:12 Joaquín M López Muñoz via Boost :

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No dia 29 de abr. de 2024, às 17:42, Takatoshi Kondo via Boost escreveu:

Dear Boost Developers,

I'd like to propose a MQTT library to the Boost Libraries.

I’m endorsing the lib, but more generally I’m endorsing the presence in Boost of an MQTT client/server facility, which connects to the point raised by Klemens on having a conversation on the merits/synergies of the two current proposals.

Joaquín M López Muñoz

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