My pleasure, glad you liked it!

Thank you for your feedback, happy it is useful! Let me know if you post your code online. I am now making a video on Xamarin and BLE as per request. I have not looked into Flutter yet.

FYI: just uploaded my video on Xamarin and BLE ukposts.info/have/v-deo/i5Z4qYKqgpuAxnk.html

Great video

My pleasure

Let me make sure I understand the question correctly: you are asking how you can use the value received in the CharacteristicCallback function in the main loop on the server? Basically you can make a global variable, assign it in the callback and use it in the loop. See as well: arduino.stackexchange.com/questions/77882/how-to-get-variable-from-callback-function Hope this helps

Thank you very much for your feedback. The problem you raise is indeed not very straightforward. Unfortunately I am completely swamped with work (hence the late response) and I have no time for creating content. I hope this will change in the mid-term, but for now I unfortunately cannot assist.

Great to hear that you were able to solve the problem on the server side for scaling characteristics. When you say the phone emulator crashes, do you mean the nRF app? That would be a bit surprising to me as it has been quite stable for me.

I have not tried that yet, but it should be possible to use the same callback function for multiple characteristics

I would recommend to write all callbacks in the same class. You can read the UUID from pChar to figure out which Characteristic was received.

Yes, it is possible to connect 2 clients to a single server with BLE. However, I have not tested this yet myself. At the moment I am quite busy with work, but will look into it when I have some free time again.

Thank you for your comment. I will look into this, however, I am traveling this week, so it will take me some time

I just tried to read more characteristics and this worked without a problem. Please refer to my github page for the code I used. It read in all 9 Characteristics without a problem.

@@mothunderz Thank you for your swift reply. I have looked at your code in "BLE_client_many_char.ino" and as far as I can see , in the notifyCallback() function you only look for the first UUID. I have expanded upon your code, looking for seven differnet UUID notifications, and only the first four gets detected. Have you tried to detect all nine UUID notifications in the callback function?

@Johan Thank you for coming back to me with this. I could reproduce the limitation you describe above. I created a server with 8 notifications and could only detect four at the receiver. However, after a bit more investigation I saw that this is a receiver problem -> when I tested with the nRF app as receiver everything was working fine. After (quite) a bit of Googling it seems that the reason is that the ESP32 is limited in HW to receive only 4 notifications. However, I did create a workaround for you. Please navigate to: github.com/mo-thunderz/Esp32BleManyChars and download BLE_many_notify_workaround_server/client. In this example I use one notification to read out 8 characteristics. I hope this works for you.

@@mothunderz You are brilliant. Good detective work! And a smart work around, that should work for me, as I control both the server and the client. Thank you for helping me out and for your good videos.

In general I have only tested with nordic whether the BLE server is setup correctly. It is a very powerful tool, but I have not yet looked into the functionality you are asking for. Hope you find a good solution.

My apologies, but I do not understand your request. What do you mean with "can you give advantages BLE at least 5"? Do you mean examples?

sorry Sir, am new in these learning, but I need just short written importance of using BLE or anyway Sir if I have questions about previous tutorials can I ask? and where? I worry to comment on past several months, please! help me.

It is unclear to me what exactly you need help with. BLE is useful for applications where you need to be energy efficient. Wifi consumes a lot more energy but provides a higher bandwidth. As for your question on where to ask questions: best is to ask these with the video that covers that topic. I do check questions with older videos as well. However, please try to be specific. Thank you

ok, thank you! Sir, I understand

It definitely is possible to take data from the serial monitor and the forward it through BLE. However, I have not looked into this myself yet. As I am swamped with work at the moment I cannot assist here. My apologies.

My apologies, but I unfortunately do not have the time at the moment to re-write code from HM10 to ESP32.

Pls check out this series on WiFi with the ESP32: ukposts.info/have/v-deo/aWWJZI2tfpeHyGw.html I still have not had time to make the video on ESP32 to ESP32 communication with WiFi, but that should be relatively straightforward if you follow Part 2 and Part 3 of this series. Am now finishing a video on Xamarin, but will upload it after that.

Thank you very much for your feedback! Very much appreciated