Graphs

[Robert-0410]

To whom ever is interested we can put some ideas together to plan and implement some graphs into the Android client. Please let us know why graphs are a good or bad idea.

[jamesarich]

I'm pro graphs: tracking datapoints over time visually would be real nice. Environmental sensors, battery/voltage stats, airtime/usage are all available (and handy) on the Apple version.

[b8b8]

what's the thoughts on combining graphs?

im thinking temperature and humidity always on the same graph, VOC's and particulate (when it gets added to read-outs) air quality on one graph as well.

[Robert-0410]

At the moment this feature seems like a whole lot of work from my perspective. In order to get started i'll start with something simple like the battery stuff. With that being said I like what you have stated in the discord discussion as far as potential graphs. If you have the time can you please document that information here in this thread for future PRs?

[jamesarich]

I did a little sleuthing in the codebase and from what I'm gathering, the database is not currently storing historical telemetry records that a graph would need for backing data. Only updating/creating the node with the latest seen telemetry data.
This would require a bit of effort/rework on the database. @andrekir can you confirm?

Meshtastic-Android/app/src/main/java/com/geeksville/mesh/service/MeshService.kt

Line 828 in b4221c7

private fun handleReceivedTelemetry(

[andrekir]

MeshPackets are saved to the MeshLog. they are used in the debug panel and export CSV feature.

[jamesarich]

Aha, so we'd need to build some queries to put together the historical telemetry per node.

[Robert-0410]

Seems to me like the DebugViewModel holds the logs, we could leverage it for the specific data we need.

[b8b8]

Graph Layout Suggestions i mentioned on Discord:

Graph 1: Device Telemetry
battery percent
channel util.
airtime
SNR

Graph 2: Environmental
temperature
humidity
barometric pressure
VOCs until enough sensors supported to have a dedicated "hazards" graph

Graph 3: Hazards
VOCs
particulate (needs firmware code)
radiation
CO2

Graph 4: Extended Environmental
wind speed
wind direction
rain fall

Graph 5:

• All 3 power metric channels

[Robert-0410]

Awesome thanks!

[Robert-0410]

Now that we have Device, Environment, and Signal graphs. What's a good next addition?

[b8b8]

Power graphs so each of the 3 channels gets its own voltage and current line of similar colour on a single graph. Channel one voltage red, channel one current light red, etc for channel two and three. One axis is current, one axis is voltage like how Snr and rssi get opposite ends of the graph.

[Kealper]

I'm definitely interested in power graphs and I'm sure almost anyone else running solar nodes with current sensors would be as well. It would be quite useful to see graphs of current flow (or negative current flow depending on how you've wired your sensor to show battery charging) over time.

[garthvh]

We are also adding a service to use for the live activity widget on iOS that may be a good source of some of this data for Android

meshtastic/firmware#4292

[Robert-0410]

Ok, thanks for the heads up. A cool little widget sounds interesting.

[Robert-0410]

Chart Libraries

Hey @andrekir
Reaching out to get your input on what chart library you recommend we use.

Currently I retrieve the DeviceMetrics from the MeshLog and display them to the user.

[andrekir]

for line charts you can use the Compose Canvas directly. it's easy to use and highly customizable.

you can find lots of tutorials online and examples from other open source apps like https://github.com/CoinTrend/CoinTrend

[jamesarich]

@rcarteraz also mentioned https://github.com/patrykandpatrick/vico a while back too #979 (comment)

[jamesarich]

but it would be a fun Compose excercise to roll our own on Canvas, too 👍

[Robert-0410]

Ok, Canvas it is.

[b8b8]

I added SNR to the telemetry graph layout suggestion. This would really help with debugging and antenna testing over time. SNR includes RSSI so i dont think that should have a dedicated line.

[garthvh]

There is some math that goes with the colors, the preset is an input to the calculation

[garthvh]

https://github.com/meshtastic/Meshtastic-Apple/blob/2441255a958219bdbb461fb27272921178b50438/Meshtastic/Views/Helpers/LoRaSignalStrengthIndicator.swift#L74

[garthvh]

meshtastic/design#15

[Robert-0410]

Thanks that stuff looks useful to me.

[Robert-0410]

@garthvh once the dust begins to settle with the 2.5 stuff I could implement the signal meter for our node cards.
I'm guessing you display it in the ios equivalent?

[b8b8]

How long is the data being stored in the graph?
A rolling one week or until manually cleared?

[garthvh]

Uses the same data that is in your debug log.

[b8b8]

Tabbed graphs look good, nice way to easily add more without getting cluttered.

[valzzu]

Any plans to add power telemetry?

[b8b8]

The list i added above is kinda the plan that people seemed happy with on discord. Power telemetry is on that list. I'm sure this stuff will all get added with time. I personally cannot wait for all 3 channels of power telemetry to be added. So many possibilities 🙃

[valzzu]

Oops 😅 didn't see that