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ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages
Post 303043619 by Neo on Sunday 2nd of February 2020 10:45:36 AM
02-02-2020
Administrator
Update:
After a lot of "messing around" with every combination of settings under the sun, I finally got the IOT-ON-OFF IOS Dashboard app working. Success. It's not a "pretty" as Blynk, but in many ways it is much better. For example we can easily switch between dashboards (see image below) and we don't have to pay for "widgets" foreach new app; and with a one time, very small purchase, we can get UNLIMITED widgets and dashboards. Here are some samples from my two previous mini-apps, (1) Wuhan Coronavirus Status and (2) Server Load Averages, all done with MQTT.
It's really quite remarkable if you think about it. I've built these two apps from scratch in two days, and that included wasting a lot of time evaluating and bumping heads with Blynk yesterday (and the headaches that caused).
Later I will summarize my notes on the "tricks" to get the IOT-ON-OFF app working so you don't have to waste your time fiddling around with all the settings. This iPhone dashboard app is not really "super polished" but it's not bad at all.
WUHAN CORONAVIRUS STATS:
[ 
SERVER LOAD AVERAGES:
SWITCHING BETWEEN DASHBOARDS
SERVER LOAD AVERAGES:
After a lot of "messing around" with every combination of settings under the sun, I finally got the IOT-ON-OFF IOS Dashboard app working. Success. It's not a "pretty" as Blynk, but in many ways it is much better. For example we can easily switch between dashboards (see image below) and we don't have to pay for "widgets" foreach new app; and with a one time, very small purchase, we can get UNLIMITED widgets and dashboards. Here are some samples from my two previous mini-apps, (1) Wuhan Coronavirus Status and (2) Server Load Averages, all done with MQTT.
It's really quite remarkable if you think about it. I've built these two apps from scratch in two days, and that included wasting a lot of time evaluating and bumping heads with Blynk yesterday (and the headaches that caused).
Later I will summarize my notes on the "tricks" to get the IOT-ON-OFF app working so you don't have to waste your time fiddling around with all the settings. This iPhone dashboard app is not really "super polished" but it's not bad at all.
WUHAN CORONAVIRUS STATS:
[
SERVER LOAD AVERAGES:
SWITCHING BETWEEN DASHBOARDS
SERVER LOAD AVERAGES:
This User Gave Thanks to Neo For This Post:
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LEARN ABOUT V7
pset_getloadavg
pset_getloadavg(3C) Standard C Library Functions pset_getloadavg(3C) NAME
pset_getloadavg - get system load averages for a processor set SYNOPSIS
#include <sys/pset.h> #include <sys/loadavg.h> int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); DESCRIPTION
The pset_getloadavg() function returns the number of processes assigned to the specified processor set that are in the system run queue, averaged over various periods of time. Up to nelem samples are retrieved and assigned to successive elements of loadavg[]. The system imposes a maximum of 3 samples, representing averages over the last 1, 5, and 15 minutes, respectively. The LOADAVG_1MIN, LOADAVG_5MIN, and LOADAVG_15MIN indices, defined in <sys/loadavg.h>, can be used to extract the data from the appropri- ate element of the loadavg[] array. If pset is PS_NONE, the load average for processes not assigned to a processor set is returned. If pset is PS_MYID, the load average for the processor set to which the caller is bound is returned. If the caller is not bound to a pro- cessor set, the result is the same as if PS_NONE was specified. RETURN VALUES
Upon successful completion, the number of samples actually retrieved is returned. If the load average was unobtainable or the processor set does not exist, -1 is returned and errno is set to indicate the error. ERRORS
The pset_getloadavg() function will fail if: EINVAL The number of elements specified is less than 0, or an invalid processor set ID was specified. The caller is in a non-global zone, the pools facility is active, and the specified processor set is not that of the zone's pool. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
uptime(1), w(1), psrset(1M), prstat(1M), pset_bind(2), pset_create(2), Kstat(3PERL), attributes(5) SunOS 5.10 28 Jun 2004 pset_getloadavg(3C)