Take Control of Your Cellphone: Wireless Screen Mirroring with scrcpy & Tailscale

Control a Android Device Wirelessly Including Full Screen Mirroring

Using scrcpy & Tailscale, along with your mobile device's data - and an interesting use...

Project: DIY Thermal Drone (Part 1)

This started as a deep dive into scrcpy—learning how to mirror and control my cellphone from my PC. But I wanted to push the limits: fully wireless, over mobile data, using the phone as a passthrough for external peripherals.

Specifically? A thermal camera dongle.

Can I strap this entire rig to a drone- the cellphone with the thermal dongle- and build a ghetto thermal-image capable drone?

This post covers the initial remote camera setup, starting of with some initial food for thought, further diving deeper into things to give us an intresting end product- hopefully. Because this is a project you'll definitely want to show off, I’m also breaking down the CMD OpSec you need first. These privacy and security commands ensure you can share your progress safely—without doxing your IP or accidentally handing the internet full access to your phone.

Some time ago, I'd discoverred scrcpyC- my phone's(and not just phone...but phones) screen, oh that delicate sceens of ours on our devices. Some times, all in, full on shatter, some pixels barely visible- other times, it'd start with a small fracture... still usable, until it isn't. And o course everything is now set up to 2FA.... even setting up a new device...go to apply our accounts onto it and you get a pop up that reads, "please see the security code we sent to..." to the other phone..the one you are replacing...because...because...the screen doesn't work, you can't see anything on it, nor most times click on anything. The phone buzzed, dingged, a notification something came through at that moment. For sure it was that damn 2FA code! Learning about OTG- some phones, all it takes is to plug in a wired mouse and keyboard through a small USB hub..and you can control your phone again...but, you are still stuck since you can't see anything.

Continue down the rabit hole and come across scrcpy- how could one not, it is a pretty popular/ powerful tool. Using it, a complete mirror of your device can be emulated on your PC... with full on controls- many, many other options...such as giving it a command to shut down the phone's screen while still mirroring it on your PC- to save battery life- other commands can change frame rates, quality, to lower any possible lag. Really cool program. I have made a posit about it some time ago... in this post, I'll be exploring scrcpy further, in an more advanced way- for some unconventional means

Though scrcpy allows for the control of your wireless device, it is still tethered, physically, by USB to your PC. Doesn't have to be. And this is some seriously cool setup- control that wireless device, wirelessly. Fully control your Android phone from your PC—viewing your screen and controlling it with your mouse and keyboard—from anywhere you have cellphone coverage. We will do this fully wirelessly (no USB after the first setup, and no shared Wi-Fi) by combining scrcpy (screen mirroring) and Tailscale (a zero-config VPN).

Initial Housekeeping & Privacy (OpSec)

Before we start connecting devices, we need to talk about privacy. If you plan to share screenshots, stream, or record your setup process, the commands we use will return personally identifiable information (IP addresses, computer names, file paths).

Don't DOX yourself. Use the following commands in your Command Prompt (cmd) to anonymize your session.

1. Anonymize Your Command Prompt

By default, CMD shows your full file path (which often includes your real name). You can change this using the prompt command.

• Remove the path entirely (changes prompt to >):

  prompt $G

• Use a Linux-style prompt (changes prompt to $):

  prompt $$

• Personalize it for your blog:

  prompt zkitszo $G

2. Clear the Screen (Wipe Old Output)

If you already opened CMD and have paths showing, changing the prompt doesn't hide the text above it. To instantly clear the active window of any previous output, use the clear screen command:

cls

3. Hide Your Profile Name in Directory Strings

When referencing paths in your tutorials, you can use a Windows variable instead of typing out your actual computer username. Use %USERPROFILE% to hide the computer name.

• Example: %USERPROFILE%\Downloads\scrcpy\ is the universal equivalent to C:\Users\zkitszo\Downloads\scrcpy\.

4. Advanced: Spoof Your Environment Variables

Many networking tools automatically pull your PC's name or your Windows username to stamp onto logs or outputs. You can temporarily fake these just for that specific CMD window.

set USERNAME=Anon
set COMPUTERNAME=Terminal
set USERPROFILE=C:\Users\Anon

5. Advanced: Filter Entire Lines

To hide any line of text that contains a specific word or IP address, use the /V switch with findstr. This tells CMD to print everything except lines containing your secret string.

ipconfig | findstr /V "192.168"

6. Make the Anonymous Prompt Persistent (Optional)

If you want CMD to automatically load an anonymous prompt every time you open it, you can modify the Windows Registry. Run this in an Administrator CMD window:

reg add "HKCU\Software\Microsoft\Command Processor" /v AutoRun /t REG_SZ /d "prompt $G" /f

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Phase 2: The Wireless scrcpy Setup

Step 1: Download the Required Resources

On your PC:

1. Download Tailscale for Windows: Tailscale Download Page
2. Download scrcpy: scrcpy GitHub Releases (Scroll to "Assets", download the scrcpy-win64-vX.X.X.zip file, and extract it to your PC).

On your Android Phone:

1. Download Tailscale for Android: Google Play Store Link

Step 2: Set Up Tailscale

Tailscale creates a secure, private network between your devices, tricking them into thinking they are on the same local Wi-Fi.

1. Install and open Tailscale on your PC. Log in.
2. Install and open Tailscale on your Android phone. Log in using the exact same account.
3. On the Tailscale app on your phone, note the IP address at the top (it usually starts with 100.x.x.x). Write this IP address down.

Step 3: Enable Developer Mode & USB Debugging

1. Go to your phone's Settings > About Phone.
2. Find the Build Number and tap it 7 times quickly to unlock Developer options.
3. Go back to the main Settings menu, search for Developer Options, and turn on USB Debugging.

Step 4: The Initial USB Connection (One-Time Setup)

You need a USB cable just for this initial handshake.

1. Connect your phone to your PC with a USB cable. (If prompted on your phone, tap "Allow USB debugging").
2. Open the folder where you extracted scrcpy.
3. In the address bar at the top of the folder window, type cmd and press Enter to open a command prompt in that directory.
4. Copy and paste the following command:

adb tcpip 5555

Once that completes, unplug your phone from the USB cable. Leave the command prompt window open.

Step 5: Connect Wirelessly over Tailscale

Now, connect the PC to the phone using the Tailscale IP address you wrote down. Type adb connect followed by your phone's Tailscale IP, and add :5555 to the end.

adb connect 100.x.x.x:5555

Step 6: Launch scrcpy (Optimized for Lag)

Because you are streaming over a mobile data connection, default settings will stutter. We need to lower the bitrate, reduce the resolution, and cap the framerate. Copy and paste this final command:

scrcpy --video-bit-rate=2M --max-size=800 --max-fps=30

A window will pop up showing your phone screen. You are now controlling your device over mobile data!

The Next Chapter

Part 1 Complete- using phone's data, scrcpy, Tailscale, full access to your device, from almost anywhere(there's data coverage).

Next, I'll take the above and apply it to the "ghetto thermal drone" setup. I already have the thermal dongle, my current phone, and a small drone.

I'll go over setting it all up, flight testing, and likely troubleshooting a few concerns I've already identified. I'll also look into specific hardware and explore cellphone options to see how lightweight and small a phone I can get that will still work with the thermal dongle. All that and more in Part 2.

Link will be posted here once the post is up- if you've seen it up and I had forgotten to edit it into here, please let me know. 

Did you learn anything from this post? Shared it with you community? Had more to add or know easier ways of doing similar? Let me know.

Ditch the Dongle on The Raspberry Pi

The Raspberry Pi Wi-Fi "Glow Up": Native Monitor Mode & Injection (No Dongle Required)

There are days when technology simply iterates, and then there are days when it quietly revolutionizes a workflow you’ve accepted as "just the way it is" for years.

For the longest time, the first rule of Raspberry Pi hacking was simple: "Buy an external Wi-Fi adapter." If you wanted monitor mode or packet injection, the onboard chip was widely considered a dead end. We all had those bulky ALFA cards or Panda dongles hanging off our sleek Pi setups, draining power and occupying USB ports.

That rule has officially expired.

Thanks to the incredible work by the Nexmon project and the recent packaging efforts by the Kali Linux team, the internal Wi-Fi chips on the Raspberry Pi 3, 4, 5, and Zero 2 W now support monitor mode and frame injection natively. No dongles. No compiling kernel modules from source until 3 AM.

Whether you are a beginner building your first portable pen-testing rig or a veteran engineer looking to slim down your EDC (Everyday Carry), here is the "glow up" your Pi has been waiting for.

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The "Why" (For the Uninitiated)

For those new to wireless auditing, the internal Wi-Fi chip on most devices is designed to be a "client"—it connects to a router and behaves. To audit a network, we need the chip to stop filtering traffic and "listen" to everything in the air. This is Monitor Mode. We also often need to "speak" out of turn to test security (like sending de-authentication packets). This is Frame Injection.

Historically, Broadcom chips (used in Pis) were locked down. The Nexmon patch modifies the firmware binary running inside the Wi-Fi chip itself to unlock these capabilities. It’s a brilliant, low-level hack that is now available via a simple package install.

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The Setup: One-Command Magic

Note: This guide assumes you are running the latest Kali Linux on your Raspberry Pi. If you are on standard Raspberry Pi OS, you will need to manually compile Nexmon (a much lengthier process).

1. Update and Install

Open your terminal. We need to grab the brcmfmac-nexmon-dkms package. This uses DKMS (Dynamic Kernel Module Support), which is a pro-tier way of ensuring your custom driver rebuilds itself automatically whenever you update your kernel. Future-proofing at its finest.

sudo apt update && sudo apt full-upgrade -y
sudo apt install -y brcmfmac-nexmon-dkms firmware-nexmon
sudo reboot

2. Verification (The "Trust but Verify" Step)

Once you are back up, don't just assume it worked. Let’s check the kernel modules. You are looking to confirm that the driver filename includes "nexmon".

modinfo brcmfmac | grep filename

Expected Output:
filename: /lib/modules/6.x.x-rpi/updates/dkms/brcmfmac.ko.xz
(Note: If it points to the standard kernel path without "updates/dkms", the patch didn't load.)

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The Workflow: Putting it into Action

Here is a real-world scenario. You want to scan for local access points using aircrack-ng tools without external gear.

Step 1: Enter Monitor Mode

We use airmon-ng to stand up the interface.

sudo airmon-ng start wlan0

⚠️ Veteran Tip / The "Unknown Error 524":
You might see an error in the output that looks like this:
command failed: Unknown error 524 (-524)
Ignore it. This is a quirky artifact of how the Nexmon firmware communicates with the kernel. It does not mean the process failed. If iw dev shows your interface is in monitor mode, you are golden.

Step 2: Start Listening

Now, let's capture some beacons. We will target the 2.4GHz spectrum (which the internal chip handles best, though 5GHz is supported on Pi 3B+ and newer).

sudo airodump-ng wlan0mon

Or, if your interface name didn't change (common with some network managers):

sudo airodump-ng wlan0

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Hardware Specifics & Troubleshooting

Not all Pis are created equal. Here is what you need to know about your specific board.

• Raspberry Pi 5: The beast. The Pi 5 uses a different architecture than the 4. Early on, Nexmon struggled here, but the new Kali 2025 packages specifically target the Pi 5's kernel (6.12+). If you are testing this on a Pi 5, ensure your power supply is solid (5V/5A); monitor mode can cause power spikes that unstable generic chargers might not like.
• Raspberry Pi 3B (The "clm_blob" Issue): The older 3B has a quirk. Sometimes, after updating, Wi-Fi vanishes entirely. This is often due to a mismatched clm_blob file (a binary blob for regulatory compliance).
  The Fix: Check your logs with dmesg | grep clm_blob. If it's failing, you may need to remove the specific blob so the driver falls back to the default:
  sudo rm -v /lib/firmware/brcm/brcmfmac43430-sdio.raspberrypi,3-model-b.clm_blob
  (Always backup files before deleting them!)
• Pi Zero 2 W: The ultimate stealth device. Because of its low power, this is the perfect candidate for this setup. However, it is very sensitive to kernel header mismatches. If dkms fails to compile during installation, run sudo apt install -y kalipi-kernel-headers to ensure your build environment matches your running kernel.

Pro-Tip: Managing Interference

The number one reason monitor mode fails isn't the driver—it's NetworkManager trying to be helpful. It sees the interface go down and tries to "fix" it by resetting it, killing your monitor session.

Before you start a serious session, run this command to kill interfering processes:

sudo airmon-ng check kill

And to restore normal internet connectivity when you are done:

sudo service NetworkManager start

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It is rare that we get to delete hardware from our kit rather than add to it. Enjoy the cleaner setup.

Reference: Kali Linux Blog: The Raspberry Pi's Wi-Fi Glow-Up

You Got This.

Navigating the Chaos: From the Shallow End to the Deep End of Success

I often look around at the content we consume and the lives we lead. We see high-budget productions and polished lifestyles, yet we often crave something genuine—a "grassroots" reality. If you have stumbled across this post while navigating your own hardships, mental health struggles, or just a creative block, I want to offer you a perspective on resilience.

Whether you are dealing with controversial situations, critics, or just the weight of your own ambition, know this: The challenges you are facing are just symbols. They are messages signaling that you are on the right path.

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1. The Power of Just Starting

We often self-sabotage before we even begin. We doubt ourselves; our posture slumps, and we stare at the floor. But the secret to overcoming a daunting task—whether it's surviving the first day of school, completing a complex report, or recovering from a depressive episode—is simply to start.

When you feel stuck, try this:

• The Random Page Method: Take a book of projects (like electronics or crafts) or a blank sheet of paper.
• Don't Think: Close your eyes, flip to a random page, and commit to doing whatever is there.
• Find the Flow: Even if you are just scribbling circles or jagged lines, the action breaks the paralysis. Before you know it, you are hypnotized by the work, and the spark of creativity returns.

2. Dealing with "Energy Vampires"

As you grow, you will encounter "haters." It is an unfortunate law of nature. Beware of the "wolves in sheep's clothing"—the "yes men" who praise you to your face but criticize your character when you aren't there.

These people latch onto others because they know they cannot succeed on their own. If you feel drained after spending time with someone, they are an energy vampire. You should feel energized and spontaneous from the company you keep. If your current environment is suffocating you, look for "hacker spaces," clubs, or groups-  there are plenty of community colleges, recreation centers, universities/ schools, union halls, churches, private locations, with weather permitting even outdoors- courses/ classes/ programs on a huge assortment of subjects - casual drop-in studio spaces with machinery/ tools/ supplies you have access to- sometimes even a space of your oun so that you don't get paint all over  your home or bother all your neighbors from the noise of tinkering/ creating...classroom style environments where either  career teachers are making an extra buck teaching in the evenings/ subject matter experts/ professionals/ experts formal; even receive a certificate or diploma upon completion- credits towards more formal  educational paths where you can expand and grow. Not only the education value, but you get to connect with others, many times those who you may not have otherwise- network- learn new skills- learn new knowledge- grow- an investment in self. Your health; there are courses, weather depending, that teach outdoor skills, or yoga, or a group gym class, or Thi Chi...

How Do I Find These???

Get yourself over to the local library, community center, church, even some corner stores. Many/ most of these will have either a section of their facility that will have public postings and information on school programs/ more formal education/ paid courses/ classes.... where you can find posters that people have lift up, or pamphlets to take... brochures, zines, business cards... some times even snacks, candy, cookies, water, coffee- can't beat that.Visit these locations that have these resources often since new programs come up all the time. You may even find postings which will actually pay you to participate.

3. The Universe is a Baby

Here is a life lesson that sounds ridiculous but works powerfully. Think of the Universe as a baby. It doesn't understand irony or negation; it only understands energy.

If you constantly talk about what you don't want ("I hate being broke," "I hate this situation"), the Universe simply sees you pouring energy into that subject and gives you more of it. A plant grows toward the light, not the shadows.

• Reframe your thoughts: Instead of dwelling on a failure (a circuit that puffed smoke), see it as a learning opportunity.
• Visualize: Wake up and tell yourself, "Today is going to be an amazing day." Stand like you just won a marathon. It triggers a hormonal response in your body.

4. The Economics of Resilience

Success is compound. For many, keeping $100 in the bank month-to-month is a massive struggle. But once you master the discipline to keep $100, you learn the skills to keep $1,000.

It requires sacrifice. Do you need the $60 data plan when there is free Wi-Fi everywhere? Do you need to sell low-margin items that eat your profit in shipping costs? No. You learn to bundle your efforts, raise your standards, and work smarter. Once you hit the higher numbers, you realize something shocking: There is less competition at the top.

5. The Swimming Pool Metaphor

Imagine success as a swimming pool.

The Shallow End (The 99%): This is absolute chaos. It is crowded. Kids are screaming, splashing water in each other's faces, and using pool noodles as weapons. It is reactive, emotional, and messy.

The Deep End (The High Performers): This is where you want to be. Here, it is just you and a handful of focused individuals. The movements are coordinated. Every breath is timed. Every stroke is efficient. There is no splashing, only high-performance laps.

It is easy to be lured back into the shallow end—maybe by a distraction or a toxic relationship. But remember the peace and power of the deep end. Stay focused. Stay strong. If it were easy, everyone would be doing it.

You got this.

A Screen for Mobile Applications- Raspberry Pi and...

Someone looking for a small screen for projects this is a decent choice... The 4.3'' version. Nice quality, easy to setup and pretty much plug and play. It's Waveshare... Good, solid products.... https://www.waveshare.com/4.3inch-hdmi-lcd-b.htm Tried, tested on the Pi 4, Pi 5... And looKY that... Even the Jetson.

YouTube Did a Thing

 You notice? 

YouTube... at least in my case... out of the blue... and I am sure for those dedicated enough there is a site or email list thaqt shares these types of things coming down the pipelines- it is Alphabet after all. Most of their doings have been documented with documentation ontop of documentation documenting all the changes, fixes, improvements and general design.

It isn't very often that things get shaken up too much.

A slight change in orientation of ellements or a bit of a stye tweek. No this time. 

YouTube has Changed

YouTube has been changed- in someone's eye's an "update"- I consider it a down grade. Many of the features that were once availlable to all are now behind their subscription plan"(s). Damn it. Sure, i've heard many 'power users' of the platform say that it is worth it. To pay that small bit to get videos uninterrupted. I guess now, also having the many features that made things just that touh better also.

I log into my YouTube account the other week.and start que'ing up a playlist- at least they haven't taken that away from us...at least not on PC- they have on mobile- guess too many users were creating music video feeds? Maybe? I got my videos going and I sit back and have them playing in the background as I tinker away at 1 of many  plethora iof project I have on my mind. A video commes up- grat content/ subject matter...except... It's illing me how slow the narrative is fowing- tyhink Charlie Brown...The Teacher at school(i may have refrenced this also in the 'YouTube Hacks or was it YouTube Speed Hacks..something on those like that... it is a number of blog posts ago). We all have those moments, just holding back that big ol' yawn. Wanna watch, but the cadene the content is being presented at is SO SLOW. 

The Speed Hack- Gone!

There is a solution. At least there was... At the bottom right corner, the gear icon, clicking it gives us a nice set of options and features. I'd thought my browser rendered the site wrong at first...didn't load a bloc of code? Searching desperatley now for the 1 feature I use as often as I can... the Speed optio- the abillity to icrasespeed down the videos... great for studying or cramming in as much as 1 can or to make sure you don't miss a thing by slowing the video down. A ferw times I couldm't understand what was beingt said..slowed it down and got it. But, where is it?

A remenence is there- a tease. To remind you of how good thing had been. A siren of the oceans luring the exploring sailor in with their beauty and song...Clicking the one slider triggers a pop up message- the speed adjustment feature is now behind a subscription plan!

Update to SD Card Formatter, That's All

 Quiky update to add on to that initial post I shared the SD Formatter...

Original post: https://zkitszo.blogspot.com/2025/10/sd-card-formatter-thats-all.html

I'd been working on some projects and had to load a ..."flash".. sorry... an image of Pi OS onto an SD card of mine. I messed up somewheres with the setup durring boot so I required a new image flashed... but, wait! My SD card now 50mb.. when... it is suppossed to be 256gb. What. Gives?

I am not going to tollerate such a loss of storage space. I didn't dig greatly into exactly the going on's and why the card now shows this pathetic amount of storage.. I can't even flash the image I want if that is the case.

Here's where this simple SD Formatter comes in handy dandy... I am going out on a whim that the boot proscess creates a/ or some partitions when going through the initial settup of the Pi... hence the miss match is storage space- I am sure that's the case.. and tghere are programns to confirm this but I just want to get bac going on my way here  and not dilly daddle... Take that SD and the SD Formatter that I had previoussly posted about- the one from the official SD Card site... other formatters don't have this going for them. Find your SD from the drop down... select quick flash(for now, you can do whattever you like another time.) and then there is another button, "Option"... there you see the abillity to chnge the format style... leave it on quick. Juyst under that you have "Format Size Adjustment". Set that to "On". Click ok and go ahead and format. The SD Card's original storage size willl be back. How cool is that? Pretty damn cool, i'd say- no fumblin' round in a partition manager, risking ruining the SD or worse... some other drive... C drive.

Kill Em All, Processes That Is

 

A tool I use more often than I should. Mostly due to the sheer number of tabs and Chrome windows that I have going simultaneously. At times mylaptop will grind to a halt, the fan on full blast, a continuos struggle to click on "wait" when I get the "this page is not responding" pop up message.

And... all of a sudden, I am in desperatate need for computer resourccces... there's a task that came to mind that desperatelly requires attention this instance. Windows are freezing up... other programs grind to a halt... every thing is at 110%.

I used to click the ol' ctr, alt, delete, trusty, giving my fingers a yoga exercise- the Task Manager, 1 by 1 go through, "end proscess"... 1 after the other. Shutting down anything and everythig to give me back any 'semblancd of what used to be my computer. Eventually freeing up enough resources to complette whattever itr was that needed my attention this very moment- more importantly, I've now freed up more virtual memory for more tabs- back to cruising the net..

This proscess, "prosces" of shutting down.....proscesses... was incredibly tedious...took some time. And, since it was at moments where the computer wasn't at its best- many frustrating moments.

May I introduce to you a fine peice of software, "Kill Em All", as in, kill all the proscesses... and much more.

Now, I can designate important proscesses from the not so... on openning the program.. all those unneccessary proscesses gone- poof- killed. Can even set firewall rules, blocking programs from network access. Need to do some sneaky activations (old school Photo Shop i'm looking at you_) or stop Apple from constantly sending data through iTunes "Helper". Blocked. No network for you.

Also provides the abillity to uninstal those pesky applications you can't traditional way(s).

For those that dare... there is a CMD line version... also a portable version, so you can just have it run off a USB stick, no need to have it take up space on your computer.

Here you have it.... your resoursce cleaner-upper-killemall  https://www.d7xtech.com/killemall/