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Top Forums Programming 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
Old 02-02-2020
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:
[
ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages-img_724c56545d50-1jpeg


SERVER LOAD AVERAGES:
ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages-img_9122jpg


SWITCHING BETWEEN DASHBOARDS
ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages-img_d6b1cb7865ca-1jpeg


SERVER LOAD AVERAGES:
ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages-img_9125jpg
This User Gave Thanks to Neo For This Post:
 

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ATTACH(5)							File Formats Manual							 ATTACH(5)

NAME
attach, session, nop - messages to initiate activity SYNOPSIS
Tnop tag[2] Rnop tag[2] Tsession tag[2] chal[8] Rsession tag[2] chal[8] authid[28] authdom[48] Tattach tag[2] fid[2] uid[28] aname[28] ticket[72] auth[13] Rattach tag[2] fid[2] qid[8] rauth[13] DESCRIPTION
The nop request does nothing overt but may be used to synchronize the channel between two service hosts initially. The session request is used to initialize a connection between a client and a server. All outstanding I/O on the connection is aborted. The set of messages between session requests is called a session. The host's user name (authid) and its authentication domain (authdom) identify the key to be used when authenticating to this host. The exchanged challenges (chal) are used in the authentication algorithm. If authid is a null string no authentication is performed in this session. The tag should be NOTAG (value 0xFFFF) for a nop or session message. The attach message serves as a fresh introduction from a user on the client machine to a server. The message identifies the user (uid) and may select the file tree to access (aname). The ticket and auth arguments contains authorization data derived from the exchanged chal- lenges of the session message; see auth(6). As a result of the attach transaction, the client will have a connection to the root directory of the desired file tree, represented by fid. An error is returned if fid is already in use. The server's idea of the root of the file tree is represented by the returned qid. ENTRY POINTS
An attach transaction will be generated for kernel devices (see intro(3)) when a system call evaluates a file name beginning with Pipe(2) generates an attach on the kernel device pipe(3). The mount system call (see bind(2)) generates an attach messages to the remote file server. When the kernel boots, an attach is made to the root device, root(3), and then an attach is made to the requested file server machine. SEE ALSO
auth(6) ATTACH(5)
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