Doesn't work at all on my Samsung s22+. App just crashes out when you connect. Never did get it working. Also, the UUID's are wrong in the zip file

Just wondering, maybe it's clearly stated and I'm just not getting it right now: What happens, if the user would change the direction mid-click? As in after 2 Statechanges he returns back to the starting point instead of completing the click? Thank you for the nice work, it helps a lot!

Great tutorial, thank you so much.

hello Is it possible to connect a cell phone with an App Inventor application and send simultaneous data to two ESP32 modules to control different LEDs on each card? without occupying a router

Good tutorial. The APP is available in MIT app Inventor Gallery?

Thanks a lot from Turkey. Explanation is really good. I really appreciate your works..

I came here just to figure out how to hook up a Rotary Encoder, but I got so much more! Thank you for this excellent tutorial!

Hello, thank you for the content, only question I had is if the whole process can be applied for the ESP32 that uses WiFi instead of bluetooth?

The error comes as “ A fatal error occurred : Packet content transfer stopped (received 8 bytes) “ Can you please provide a solution asap , I have been banging my head and brainstorming still nothing is working. Also , I’m already using a 10uF capacitor between En and ground still the adamant error persists. Please provide a solution

@mothunderz: any idea on how many devices can be connected to esp32 through BLE?

Is it also possible to send a file from SPIFFS using ble?

hi this video helped me a lot but I still have an issue: I would like to receive data from an esp32 even when the phone is off or when the app is in the background, do you have any advice for this?

You are the goat. You just saved us so much time and it actually worked.

Quick question about Wi-fi stack. In SETUP section, we do settings of Wi-Fi- etc. What keeps wi-fi alive ? the library or ESP firmware in the background? When wi-fi dropped (from router) which one of those try to reconnect? SHould we worry about it as a programmer of library/firware takes care of all? Thanks,.

This is the only code that worked perfectly. All others I found on the internet for me only worked 80% correctly...

FIX for people having issue with sending data from app to esp32: I followed every step (nice job mate), but my app was crashing with no error whenever I tried to send data (after changing the slider position). So I've tried different things, apparently what works is to stick with only one characteristic, add the write and read property and the callback to it, and of course use the same UUID for both receiving and sending functions in the app inventor. Do know why, maybe it's my cheap phone, but it worked for me

Hi, I keep getting this compilation error after adding the "webSocketEvent()" function: "Compilation error: 'WStype_t' has not been declared" I have no clue at all how to fix it! How can I resolve this?

Thank you very much for this video. What kind of plugins do you use for notepad++ ?

Thank you. After watching alot of videos about websockets, i finally understood it here...

This was possibly one of the best programming tutorials I've ever seen, well explained and simple, really helped me a lot. How could we plot the data that the ESP32 sends to the app? And can we make this app to run in the background to receive data all the time?

Any suggestions for how to convert the values this code puts out into degrees?

you are a great streamlined teacher. Great work!

is there a way to use the rotary encoder without the interrupt pins? or can the inputs be polled instead?

Is it possible to run client and server simultaneously in one Esp32. I think its possible using the coex module in ESP-IDF but thats a bit too tough for me.

I'm very happy for discover yours videos, Thank you for a graet contribution. Do you know if is possible using this app or esp32 conect direct to a smartband to get data from heart beat? thank in advanced...

Hey, thanks for the tutorial. I ran into a problem with SPIFFS. The first upload worked fine without any problems, but now i cannot upload any modified version of the jasonscript.js or add a new file. Uploading new sketches works fine, it is just the SPIFFS part with the js. Edit: Renaming the .js file worked fine. I do not know why, maybe someone has an explanation, as renaming was not necessary for me with the .html.

Thank you for sharing this! I am a noob to Arduino Land. Will your code run on an UNO R4? If so, please provide the details of how to set it up. I would like for it to display on the R4 LED matrix. Thank you, in advance!

i am useing same library for esp32 but it showing name in NRF app in IOS but not showing in IOS Bluetooth setting place help me. i tried your code also but it not show name in ios Bluetooth setting.

what if you dont know the uuids of the device you connect to? edit: ok nvm, I just watched your other BLE videos, all clear, thank you for the videos!

Super Tutorial! Note that ESP32FS for now only works in Arduino IDE 1.X, in 2.x it will not show :) Thanks!

Please turn on line numbers to help us keep up with where you are.

Is this memory safe method? If you get bigger string and write it to the "named.json" next to second file "second.json" will it overwrite the content?

3 milliseconds, of course.

These are completely useless for small components. Only large ones.

Thanks for sharing your knowledge 👍

Hi! Thank you for this walkthrough and sample code! I learned a lot more about viewmodels too! I have a couple of questions if you don't mind. If I want to build an APK from this project, could I use the PowerShell to do that? In newer versions I could just publish with clicks but it won't let me do that for Android. Is Xamarin.Essentials still used for this in newer versions? I have looked at Shiny for the ble plugin tools but I don't understand any part of his guides. I really need to build a BLE project that scans, connects and send messages to the BLE device Thank you

I thought I had a pot, but instead I had a rotary encoder! You have unblocked my project with this helpful video. :) Thanks

Hello friend, help, I get a permission not granted error. I am up to minute 12, in the first test of the app, and I get that it does not grant the Bluetooth permission

if I want to transmit bytes and then drive the motor to rotate. How should I do this? Thankyou

tarsh

from now on you are my go-to person for useful stuff on ESP, thank you!!!

Great video man! Where did you learn all of this stuff? Do you have a book?

Very well done. You break the process down into small enough chunks to understand the communications between server and client. If I have a system which one of the two devices has to run on battery. And I will be putting the remote device into sleep mode. Would it be best to make that device the server or client, as far as power consumption goes ? I only need to be concerned with communications between those two devices.

That was great. You explain things extremely well. Thanks very much.

I can't able to see my esp32 on my list view😢is there any solution

Thank you for the tutorial, that was very helpful. BTW, I have a problem, I've tried with two possible apps from the market, the one you mentioned on your tutorial and other called BLEScanner. Both of them allowed me sending just 4 bytes from the app to the ESP32 BLE Server. I wonder if it is possible to send a bigger package of data from the app to the Server. Could you help me please? Thanks again and regards.

Thanks for the tutorial. Your tutorials are very clear. I have the following errors in the client: would you know what these errors has to do with? - Connected to server - Found our characteristics E (500048) BLE_INIT: Malloc failed App is onDisconnect part Disconnected from server... Rescan... E (508871) BT_APPL: Client_if: 255 Not Registered

leaving this comment here for anyone facing problems with the UART service that the adafruit bluefruit spi module with MIT Inventor app. If you're facing problems with the app giving an error such as "invalid UUID" but you have used the correct UUID. Try using LOWERCASE letters in the UUID variables. Also, if you have copy pasted the USART Service ID From the Bluefruit SPI's Product/Tutorial page. it wont work, due to the fact they made some of the numbers (in this case the "00001" in 6E400001-B5A3-F393-­E0A9-­E50E24DCCA9E) in the UUID bold. so you have to retype it from scratch. this solved my problem I hope it helps anyone in the future.

Another informative video, very nice job. Thank you for making these videos available.