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NodeMCU ESP8266 Blynk SSL Application for Linux Server Load Averages

 
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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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LEARN ABOUT CENTOS

ipa-replica-prepare

ipa-replica-prepare(1)						 IPA Manual Pages					    ipa-replica-prepare(1)

NAME

       ipa-replica-prepare - Create an IPA replica file

SYNOPSIS

       ipa-replica-prepare [OPTION]... hostname

DESCRIPTION

       Generates a replica file that may be used with ipa-replica-install to create a replica of an IPA server.

       A replica can only be created on an IPA server installed with ipa-server-install (the first server).

       You  must  provide  the fully-qualified hostname of the machine you want to install the replica on and a host-specific replica_file will be
       created. It is host-specific because SSL server certificates are generated as part of the process and they are  specific  to  a	particular
       hostname.

       If IPA manages the DNS for your domain, you should either use the --ip-address option or add the forward and reverse records manually using
       IPA plugins.

       Once the file has been created it will be named replica-hostname. This file can then be moved across the network to the target machine  and
       a new IPA replica setup by running ipa-replica-install replica-hostname.

       A replica should only be installed on the same or higher version of IPA on the remote system.

OPTIONS

       --dirsrv_pkcs12=FILE
	      PKCS#12 file containing the Directory Server SSL Certificate and Private Key

       --http_pkcs12=FILE
	      PKCS#12 file containing the Apache Server SSL Certificate and Private Key

       --dirsrv_pin=DIRSRV_PIN
	      The password of the Directory Server PKCS#12 file

       --http_pin=HTTP_PIN
	      The password of the Apache Server PKCS#12 file

       -p DM_PASSWORD, --password=DM_PASSWORD
	      Directory Manager (existing master) password

       --ip-address=IP_ADDRESS
	      IP address of the replica server. If you provide this option, the A and PTR records will be added to the DNS.

       --reverse-zone=REVERSE_ZONE
	      The reverse DNS zone to use

       --no-reverse
	      Do not create reverse DNS zone

       --ca=CA_FILE
	      Location of CA PKCS#12 file, default /root/cacert.p12

       --debug
	      Prints info log messages to the output

EXIT STATUS

       0 if the command was successful

       1 if an error occurred

IPA
								    Mar 14 2008 					    ipa-replica-prepare(1)