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Some clarification on Presentation, Set, Req et al

NotTooTechy last edited by

Probably a stupid thing, but I am trying to work out the correlation between "presentation" and "set req"

I understand the Presentation is a notification of sorts to the main system, but am unsure what I should be using and why for both "Presentation," and "set req" options.

So, here's what I have in the house, two systems, one for heating (240v baseboard), one for cooling (swamp cooler)
I have DHT-11 sensor in the lounge with NRF24L back to master.
I have a two-relay board at the mains box for the 240v baseboard supply with NRF24L back to master.
I have a three-relay board at the swamp for Low, High and Pump with NRF24L back to master.

What do I Present and what do I use for a "Set" command for the heating and/or cooling? There doesn't seem to be a Presentation type for "Relay" and no "Set" option for "On" and "Off."

Could someone please give me some examples of what and how to assign those combinations?

I am a Mechanical Engineer and Programmer used to seeing things in logical sequence and order, but this what-goes-with-what is a mystery to me.
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@mimaret It was a pleasure. Thank you for your feedback!
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@TheoL Not only did I put in delays, too, but I put in delays that were based upon the ID (which was stored in NVRAM)! This helped. caveat: This is probably not accurate be helps to explain the challenges with a large network. My initial experience with Arduino/nRF24 was using the libraries from TMRh20. Those libraries allowed a node to be a repeater, but only for 6 nodes. The primary node 0, master, only allowed 6 nodes to connect to it. The nodes connected to it also allowed 6 nodes. Subsequent nodes had to go through one of these repeating nodes. But the depth was only 4 deep. The master assigned node IDs if the node didn't already have one; similar to a MAC address. The master also kept track of the addresses (ARP table?). Addresses were 4 octets (base in the form of D/C/B/A. A node connected directly to the master had an address of 0/0/0/a (where 0/0/0/0 was reserved for the master). A node connected through another node had an address of 0/0/b/a, and so forth. But what happens is that a parent node has to mange the data from all its child nodes and their child nodes and their child nodes. Thus a node would get so bogged down dealing with this traffic that it din't do its sensor task very well. It is my belief that MySensors either uses TMRh20's libraries or has developed some aspects based on his initial work. I see that that TMRh20 has a version 2 and I have not experimented with it. I did find that MySensors worked better than version 1. Thus, my curiosity. I am also duly impressed at the magnitude of hardware. Currently a nano like device from Aliexperss is US$2-3, nRF24 ~ US$1, power supply ~ US$1.50, power cord ?, case?, sensors!? While the hardware cost is daunting, even with a PCB it's a lot of work building those up. So, yeah, I'm impressed! -OSD
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Nice work so far @wint0178, great that you try expanding on the examples. Sorry for the late reply. If you look at https://github.com/mysensors/MySensorsArduinoExamples/blob/bba998bce09bc5139eb4ca7a05b0279f4083ff88/examples/PressureSensor/PressureSensor.ino#L90 you see where the existing child ids are defines. You just add another one for the gas sensor, with a unique number (incrementing by 1 is an easy way). Try that and report back on your result. If something is unclear, just post a followup.

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