DevHeads IoT Integration Server•13mo ago

Btw what is your tech stack?

SSageBoy Btw what is your tech stack?

az sum misho•12/2/24, 5:05 PM

MERN but ive used some python and flask

az sum misho•12/2/24, 5:06 PM

and i want to check out iot

az sum misho•12/2/24, 5:06 PM

sounds fun

Aaz sum misho MERN but ive used some python and flask

SageBoyOP•12/2/24, 5:06 PM

Damm!... i was also a mern developer before

az sum misho•12/2/24, 5:06 PM

nice :D

Aaz sum misho and i want to check out iot

SageBoyOP•12/2/24, 5:07 PM

If i really tell you it involve working with new libraries, on different projects. (Btw i am also a beginner).

SageBoyOP•12/2/24, 5:07 PM

Not like sw or IT work

az sum misho•12/2/24, 5:09 PM

yeah

Afuevu•12/3/24, 7:09 AM

Hello, @here I have implemented some nice functionality like voltage and current readings using differential amplifiers and also using the GSM module in GPRS mode on an energy meter project I am working on. I will have a session to talk about these things tomorrow Wednesday Dec 4, 5 pm WAT. At the end of the session, we will see why using RTOS will make sense in the project. I would appreciate it if you were present, here is the link: https://app.livestorm.co/p/5507168f-31d9-45b5-9cf8-242db90bc4d8/live?s=79b27e95-039c-4ba8-8d9e-6be2a64e75c7 @ZacckOsiemo @Umesh Lokhande @undefined.elf @Joseph Ogbonna

Design and Implementation of energy meter | DevHeads IoT Integratio...

AAfuevu Hello, @here I have implemented some nice functionality like voltage and current...

segfaultdev.elf•12/3/24, 8:16 AM

Really interesting! I’m looking forward to it

AAfuevu Hello, @here I have implemented some nice functionality like voltage and current...

Umesh Lokhande•12/3/24, 10:46 AM

I’ll definitely check out the energy metering solutions, as they always interest me. I believe the session is at 9:30 PM IST—just confirming the timezone. See you there!

UUmesh Lokhande I’ll definitely check out the energy metering solutions, as they always interest...

Afuevu•12/3/24, 12:18 PM

Yes it is at 9:30PM ISt

Techist•12/3/24, 1:04 PM

Hello @wafa_ath

wafa_ath•12/3/24, 1:20 PM

Hi @Techist

wafa_ath•12/3/24, 1:22 PM

Are u done the abstract

fei•12/3/24, 3:46 PM

Hi, I was wondering when testing RFID for production, I have noticed that if the RFID tags are in a bundle and stacked tightly together one on top of each other on top of a UHF RFID reader, it will most of the time read the EPC wrong. Is this a hardware limitation or code limitation?

matthewflynn_•12/3/24, 4:01 PM

Is itpossible for me to output different apps to each hdmi port on the pi 5? Basically I have a touchscreen hookedup to hdmi 1 (nearest usbc port) and a projector on the other.

I want to be able to output control program to the touch screen and the projector output a different app?

Mmatthewflynn_Is itpossible for me to output different apps to each hdmi port on the pi 5? Bas...

melta101•12/3/24, 4:06 PM

i think it should be possible with wayland

melta101•12/3/24, 4:08 PM

not sure of the specifics but a startup shell script should suffice

melta101•12/3/24, 4:11 PM

ref: https://wayland.app/protocols/xdg-shell#xdg_toplevel:request:set_fullscreen

You could use these API if you want to make a binary

XDG shell protocol | Wayland Explorer

A better way to read Wayland documentation

melta101•12/3/24, 4:11 PM

This should help you

matthewflynn_•12/3/24, 4:18 PM

cool - thanks for the help - so is each hdmi treated as a seperate output through 1x login and can I just specify each app to a specific hdmi port?

Mmatthewflynn_cool - thanks for the help - so is each hdmi treated as a seperate output throu...

melta101•12/3/24, 4:21 PM

in wayland
it considers display from display output.
So you could specify which app to open with specific display

melta101•12/3/24, 4:21 PM

its an index WAYLAND_DISPLAY

Mmatthewflynn_cool - thanks for the help - so is each hdmi treated as a seperate output throu...

melta101•12/3/24, 4:29 PM

there seems to be a package called wmctrl which does what you want
https://linux.die.net/man/1/wmctrl

melta101•12/3/24, 4:30 PM

but you should know the resolution prior

matthewflynn_•12/3/24, 4:30 PM

thats fine I know the resolution of each screen and it will remain static - its not like I am going to hotswap or anything

matthewflynn_•12/3/24, 4:30 PM

this look good - I'll give it a go!

matthewflynn_•12/3/24, 4:30 PM

Thank you so much for the help

Ffei Hi, I was wondering when testing RFID for production, I have noticed that if the...

wafa_ath•12/3/24, 5:20 PM

That called tag collision in RFID, it's hardware limitation

AlexTryHarder•12/3/24, 6:45 PM

I have a tricky one here.
Got Firebox M590 that I want to re propose with linux.
Sadly WG being WG..., it's super locked.
I removed only bootable drive (m2) and noticed that it's still getting grub...

Found, unsoldered and extracted firmware from only flash chip on board, it contains U-boot bootloader.
And that's where Im stuck, I need to modify it to boot from m2...

If there is any magician who knows how to do it, highly appreciated
Can create a thread if needed.

AAlexTryHarder I have a tricky one here. Got Firebox M590 that I want to re propose with linux....

melta101•12/3/24, 6:49 PM

sounds Nice
Is there a uEnv.txt present in uboot

melta101•12/3/24, 6:49 PM

and do you access to the uboot shell?

Mmelta101 sounds Nice Is there a uEnv.txt present in uboot

AlexTryHarder•12/3/24, 6:50 PM

I will be honest, I completely do not know anything about firmware itself.
Tried to do binwalk and dd to extract some of them, but I think offset was incorrect and I got a lot of garbage.
Im more than happy to share .bin

AAlexTryHarder I will be honest, I completely do not know anything about firmware itself. Tried...

melta101•12/3/24, 6:52 PM

Havnt done any reverse engg
So i dont know how to tackle this lol
If atleast the shell was accessible, there was a chance to change the boot at runtime.

Sounds like a fun project
Cheer!

Hope someone can help you

AlexTryHarder•12/3/24, 6:52 PM

Any tips how to attached myself to shell?

AAlexTryHarder Any tips how to attached myself to shell?

melta101•12/3/24, 6:53 PM

Are there any UART pins

Mmelta101 Are there any UART pins

melta101•12/3/24, 6:54 PM

You could connect it to a ftdi access serial port from there

AlexTryHarder•12/3/24, 6:54 PM

There is a serial, but it's goes straight to grub, with no edit option, that's why I did extraction

AlexTryHarder•12/3/24, 6:55 PM

binwalk shows that:

Offset    Size    Description
1096073    -    CRC32 polynomial table, little endian
1630121    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)"
1670895    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)"
1722958    -    U-Boot version string, "U-Boot 1.3.01.05 - Mar 31 2021 16:09:11"
1823681    -    Flattened device tree, size: 7138 bytes, version: 17
2100972    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)' iommu.passthrough=1"
4194304    -    Flattened device tree, size: 1092272 bytes, version: 17
6291456    -    Flattened device tree, size: 9936 bytes, version: 17
6422528    -    Flattened device tree, size: 680 bytes, version: 17

Offset    Size    Description
1096073    -    CRC32 polynomial table, little endian
1630121    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)"
1670895    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)"
1722958    -    U-Boot version string, "U-Boot 1.3.01.05 - Mar 31 2021 16:09:11"
1823681    -    Flattened device tree, size: 7138 bytes, version: 17
2100972    -    U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)' iommu.passthrough=1"
4194304    -    Flattened device tree, size: 1092272 bytes, version: 17
6291456    -    Flattened device tree, size: 9936 bytes, version: 17
6422528    -    Flattened device tree, size: 680 bytes, version: 17

AlexTryHarder•12/3/24, 6:56 PM

In my noob firmware mind, I was hoping to just edit it and flash it back to chip

AAlexTryHarder In my noob firmware mind, I was hoping to just edit it and flash it back to chip...

melta101•12/3/24, 6:58 PM

It would've been that way if the HW was open source

AlexTryHarder•12/3/24, 6:59 PM

Damn watchguard

6k for hardware and still locked af

melta101•12/3/24, 6:59 PM

Have you tried typing boot to grub

Mmelta101 Have you tried typing boot to grub

AlexTryHarder•12/3/24, 7:01 PM

what you mean? On serial there is no edit option on grub entries. Either boot or boot to recovery
Both failing if hash of M2 is diffrent than original

AAlexTryHarder what you mean? On serial there is no edit option on grub entries. Either boot or...

melta101•12/3/24, 7:01 PM

I mean grub shell

AlexTryHarder•12/3/24, 7:01 PM

Oh, there is no grub shell, just predefined boot options

AlexTryHarder•12/3/24, 7:02 PM

something like that, without last option tho

AAlexTryHarder something like that, without last option tho

melta101•12/3/24, 7:02 PM

Press C

Mmelta101 Press C

AlexTryHarder•12/3/24, 7:03 PM

Box is at work, will try tomorrow and report back.
If that will work I will be suprised

Offset Size Description 1096073 - CRC32 polynomial table, little endian 1630121 - U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)" 1670895 - U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)" 1722958 - U-Boot version string, "U-Boot 1.3.01.05 - Mar 31 2021 16:09:11" 1823681 - Flattened device tree, size: 7138 bytes, version: 17 2100972 - U-Boot version string, "U-Boot 1.3.01.05 (Mar 31 2021 - 16:09:11 -0700)' iommu.passthrough=1" 4194304 - Flattened device tree, size: 1092272 bytes, version: 17 6291456 - Flattened device tree, size: 9936 bytes, version: 17 6422528 - Flattened device tree, size: 680 bytes, version: 17

Btw what is your tech stack?

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