zhongfu's inane ramblings

chomky soldering iron

trying to revive an overdischarged drone battery, will i end up regretting this?

my device list on google play is kind of degenerate but yknow, what can i do

committing one or two war crimes while mounting a projector

they made me charge it up because they didn't believe they could've fucked up this badly, but they did actually fuck up this badly, so now I gotta drain the battery

bought a 12V 40Ah LTO battery for shits and giggles, it came pretty heavily discharged cuz the bms got turned on in transit 💀

newsflash: I'm stupid and there's a newer version of the app

yea the app looks like shit but now i can turn on my a/c remotely

hell yeah charge limiting works

haha yeah just fuck my shit up

now i just have to solder the joints up and wrap everything up in fabric tape

...and maybe get some proper wire stripping tools, apparently solid copper is quite a bit harder than my fingernails?

this will go into a car for tapping 3 of the CAN buses + 2 for ground and power, for telemetry and control (not the driving kind)

custom harness and cables for a custom (?) thing (halfway done)

brought to you by some old Ethernet cables, a pair of scissors, and an RJ45 crimper

starting to realize that they might've actually been running all the logic (like, voip, talking to their servers, etc) on the modem itself

which means I'll have to figure out how to root the modem too

oh hell yeah, they left the adb interface open, how nice of them

android 7.1.2

kernel's compiling *spins on chair*

The Qualcomm Snapdragon 210 MSM8909 is an entry level SoC for Android based tablets and smartphones. It contains four ARM Cortex-A7 CPU cores (quad core) with a clock rate of up to 1.1 GHz, an Adreno 304 graphics card, an LPDDR2/LPDDR3 memory controller (max. 533 MHz), a eMMC 4.5 port, and a LTE Cat 4 radio module.

The performance of the Cortex-A7 cores is rather low and positioned in the entry level of 2015. In our tests of the CAT S40 smartphone, daily tasks and browsing however imposed no problem for the SoC.

The integrated Adreno 304 graphics card is clocked at 400 MHz and also positioned in the entry level. Therefore, demanding games may not run smoothly in high settings.

The integrated video engine allows the encoding and decoding of 1080p H.264 videos and decoding of H.265 videos. The main display can be driven with up to 1280x720 Pixels.

The SoC integrates Bluetooth 4.1 + BLE, 802.11n (2.4 GHz) WiFi, and a Cat 4 4G-LTE-Modem (LTE FDD, LTE TDD, WCDMA (DC-HSDPA, HSUPA), CDMA1x, EV-DO Rev. B, TD-SCDMA and GSM/EDGE) with a max. speed of 150 Mbps.

you cannot do any of these on the MT7628

the funniest thing is that the modem (MSM8909, a.k.a. Snapdragon 210) is WAY more powerful than the MT7628/MT7688 on the mainboard, besides having 8x the RAM and 250x the storage

MT7628 goes on shitty $15 routers, SD210 goes on (very low end) Android smartphones

next would probably be figuring out how the mt7628 "mainboard" talks to the LTE modem, it seems like there's custom firmware that exposes just an RNDIS ("usb networking") interface, through which you're supposed to connect to a MQTT server on it