ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages
Here we go....
Preface:
Quote:
Rant: After a "very interesting" experience back-and-forth with Blynk yesterday over their "pull money out of your pocket for every tiny widget" business model when I was publishing a quick public service app to help folks in China regarding the Wuhan coronavirus, in also combination with the Blynk "terms of service" which permits Blynk to share all of a user's network data, every message, all user mined behavioral analytical "raw material" and share that data with any and all third parties; I decided to build my own messaging network to test these ESP32.......
..... so in a galaxy far, far, far away from commercial, data sharing corporations.....
For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages. Here is the Arduino IDE code I wrote for the MQTT client running on the ESP32:
Crontab entry on Linux:
Here is the crontab PHP file which publishes the server load average messages:
Here is the sample output in the Arduino IDE serial monitor:
So far, no joy in finding a good IOS app for the iPhone to display this data in a nice dashboard.
I did find an OK "MQTT Terminal App" for the iPhone and I did confirm I can subscribe to these messages with MQTT on the iPhone. Unfortunately, all the "pretty dashboard apps for MQTT" I tried in the app store has some problems and none worked well "out of the box". However, the simple MQTT terminal apps work fine (but are not "pretty")
The MQTT terminal app I tested, which managed to work, does not add line breaks at the end of a message, and when I tried to send line breaks over MQTT, the clients stopped receiving the messages, which is expected since these pub/sub client/servers are not really meant for formatted data. Maybe I'm missing something small?
Hello,
I'm facing a big problem with my hosting server (Dual Xeon 2.4GHz), I'm having a load in the CPU usage and the memory (maybe it's related) ALSO mySQL:
Server Load 5.34 (2 cpus) (to 22 sometime)
Memory Used 68.4 % (to 70% sometime)
When I go to 'CPU/Memory/MySQL Usage' I found:
... (3 Replies)
Hi all
what are the ways by which we can know and generate a report of the space remaining, memory(ram) used and the load on the server over a period of time. (1 Reply)
we have an unix system which has
load average normally about 20.
but while i am running a particular unix batch which performs heavy
operations on filesystem and database average load
reduces to 15.
how can we explain this situation?
while running that batch idle cpu time is about %60-65... (0 Replies)
Hello all, I have a question about load averages.
I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Hi
anyone know how to setup a setup a virtual IP to control 2 server load for linux? i only have 2 server, i don want to buy another just for the load balance... is there a way to do it?
Sumemr (0 Replies)
Hello AlL,..
I want from experts to help me as my load average is increased and i dont know where is the problem !!
this is my top result :
root@a4s # top
top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66
Mem: 8168788k total, 2889596k used, 5279192k free, 47792k... (3 Replies)
Hello I am running a liferay application in tomcat on one of my hosted linux machine having 4GB of ram and 1 CPU.
I get the tomcat response really slow and with much digging I found that the cpu might be loaded and can be tracked with top command.
The following is the output of top command:... (0 Replies)
Currently have two ESP8266 modules testing some Blynk apps, whereI'm not so happy with the Blynk business model for developers, but that's another story.
So, with two of my ESP8266s currently "busy", I decided to work on the ESP32, and in particular the ESPWROOM32.
I installed the... (0 Replies)
I have been wrangling with a small problem on a Ubuntu server which runs a LAMP application.
Linux ubuntu 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
This server runs fine, basically:
ubuntu:/var/www# uptime
20:17:13 up 105 days,... (45 Replies)