mqtt

问题 Im using system.Net.mqtt in a Xamarin project. I create a server like this: var server = MqttServer.Create(); server.ClientConnected += Debug; server.ClientDisconnected += Debug; server.Stopped += (o, e) => Debug($"disconnection ! {e.Message} and {e.Reason} "); server.Start(); I have a nodeMCU coded y micropython. If I start and android MQTT broker in the phone I CAN connect to it from the nodeMCU, and push and subscribe to messages. Flawless. But if I switch off the broker and start the

问题 Im using system.Net.mqtt in a Xamarin project. I create a server like this: var server = MqttServer.Create(); server.ClientConnected += Debug; server.ClientDisconnected += Debug; server.Stopped += (o, e) => Debug($"disconnection ! {e.Message} and {e.Reason} "); server.Start(); I have a nodeMCU coded y micropython. If I start and android MQTT broker in the phone I CAN connect to it from the nodeMCU, and push and subscribe to messages. Flawless. But if I switch off the broker and start the

问题 MQTT is a publish/subscribe protocol. Whenever a publisher publishes to a topic, all the subscribers that have subscribed to that topic will get the message via an MQTT broker. I would like to know the maximum number of clients an MQTT broker can handle. Is there any upper limit for that? 回答1: The only way to work this out is to test depending on your specific workload. It will be entirely dependent on the following: The size of the machine you run the broker on. The size of the messages you

问题 MQTT is a publish/subscribe protocol. Whenever a publisher publishes to a topic, all the subscribers that have subscribed to that topic will get the message via an MQTT broker. I would like to know the maximum number of clients an MQTT broker can handle. Is there any upper limit for that? 回答1: The only way to work this out is to test depending on your specific workload. It will be entirely dependent on the following: The size of the machine you run the broker on. The size of the messages you

问题 MQTT is a publish/subscribe protocol. Whenever a publisher publishes to a topic, all the subscribers that have subscribed to that topic will get the message via an MQTT broker. I would like to know the maximum number of clients an MQTT broker can handle. Is there any upper limit for that? 回答1: The only way to work this out is to test depending on your specific workload. It will be entirely dependent on the following: The size of the machine you run the broker on. The size of the messages you

问题 I am running the 17.04 version of ubuntu with mosquitto server and clients installed. I've generated a set of certificates with: openssl genrsa -out ca.key 2048 openssl req -x509 -new -nodes -key ca.key -sha256 -days 3650 -out ca.crt openssl genrsa -out server.key 2048 openssl req -new -key server.key -out server.csr openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 3650 -sha256 placed them into /etc/mosquitto/ca_certificates and configured

问题 Is it possible to that two clients are subscribed to same topic in MQTT broker. And based on authorization, some of the massages are sent to one client and not other (subscribed on same topic). 回答1: No Any number of clients can be subscribed to a given topic, but you can not limit which of those clients can receive messages on that topic on a per message basis. It is all the topic or none. 回答2: There is no direct solution for this approach. But however I have a workaround for this solution.

问题 I have been trying to publish a subscribe message using MQTT, but whenever I run my script it gives me this error: Fatal error: Class 'Mosquitto\Client' not found in /Applications/XAMPP/xamppfiles/htdocs/Mosquitto-PHP-master/examples/pub.php on line 3 This is connection: $client->connect("localhost", 1883, 5); I have downloaded code from below: https://github.com/mgdm/Mosquitto-PHP I tried to download code using pecl command but it gives me error: No releases available for package "pecl.php

问题 I am creating an instant messaging system using Paho Android MQTT Client. Its implementation works as expected, however I am facing these errors. I call the Connection Class ( This also calls for the creation of the connection to the broker) in the onCreate of the MainActivity Class . Now the problem is that, assuming I am on the MainActivity Class and I press back to move from the MainActivity Class to another activity, and I later come back to the MainActivity Class , another broker

问题 I am creating an instant messaging system using Paho Android MQTT Client. Its implementation works as expected, however I am facing these errors. I call the Connection Class ( This also calls for the creation of the connection to the broker) in the onCreate of the MainActivity Class . Now the problem is that, assuming I am on the MainActivity Class and I press back to move from the MainActivity Class to another activity, and I later come back to the MainActivity Class , another broker