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Top Forums Programming NodeMCU ESP8266 Blynk SSL Application for Linux Server Load Averages Post 303043605 by Neo on Saturday 1st of February 2020 11:18:45 PM
Old 02-02-2020
After looking into this, I found some promising iPhone apps which do not share your data with third parties and will test the mosquitto broker to set up a private pub/sub network to send and receive messages to and from these ESP8266 and ESP32 devices.

Quote:
Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices from low power single board computers to full servers.

The MQTT protocol provides a lightweight method of carrying out messaging using a publish/subscribe model. This makes it suitable for Internet of Things messaging such as with low power sensors or mobile devices such as phones, embedded computers or microcontrollers.

The Mosquitto project also provides a C library for implementing MQTT clients, and the very popular mosquitto_pub and mosquitto_sub command line MQTT clients.
I have already set up a mosquitto broker on Ubuntu, the basic security authentication and can send a message from my ESP32 device to the remote Linux server. Will discuss this in another post.
 

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imqkeytool(1M)						  System Administration Commands					    imqkeytool(1M)

NAME
imqkeytool - generate a self-signed certificate for secure communication SYNOPSIS
/usr/bin/imqkeytool [-broker] [-servlet keystore_location] /usr/bin/imqkeytool -h DESCRIPTION
The imqkeytool utility generates a self-signed certificate for secure communication. The certificate can be used by a broker instance to establish a secure connection with a client, or by a Message Queue-supplied HTTPS servlet to establish a secure connection with a broker instance. An HTTPS servlet is an SSL-enabled varient of the HyperText Transfer Protocol that establishes a secure connection with a broker instance. Without an option, imqkeytool generates a self-signed certificate for a broker instance. imqkeytool uses command line options to specify whether the certificate is used by a broker instance or by a servlet. OPTIONS
The following options are supported: -broker Generate a self-signed certificate for the broker and places it in the Message Queue keystore. All broker instances running on a system must use the same certificate. -h Display usage help. Do not execute anything else on the command line. -servlet keystore_location Generate a self-signed certificate for an HTTPS servlet and places it in keystore_location. keystore_location refers to the location of the keystore. You should move this keystore to a location where it is accessible and read- able by the Message Queue HTTPS servlet to establish a secure connection with a broker. ENVIRONMENT VARIABLES
The following environment variables affect the execution of this command: IMQ_JAVAHOME Specify the Java 2 compatible runtime. When this environment variable is not set it defaults to /usr/j2se. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/etc/imq/keystore Contains Message Queue keystore in which imqkeytool stores a self-signed certificate for brokers. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWiqu | +-----------------------------+-----------------------------+ SEE ALSO
imqadmin(1M), imqbrokerd(1M), imqcmd(1M), imqdbmgr(1M), imqobjmgr(1M), imqusermgr(1M), attributes(5) Sun Java System Message Queue Administrator's Guide SunOS 5.10 11 Mar 2004 imqkeytool(1M)
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