Hello. I want to send ECG graphic data with ESP32 via ble to a mobile app. So far I have been able to connect to my phone by using BLE on esp32. I've sent computer made heartbeat data to nRF mobile app. There is also an app made entirely for displaying ECG graphics called Bluetooth Terminal/graphics. However, even though my phone is connected to esp32 via ble, the app displays an error saying "cannot connect to device".
I am just starting and cannot understand or write code. I want to adjust the example code that I use for connecting to nRF mobile app or write my own code for sending ECG data. Problem is that I do not know where to start and what to learn. I do not want to learn arduino from scratch since the only thing I need for my project is sending ECG graphic data with ESP32 via ble.
Please lead me to some tutorial or guide as a starting point. I've watched online tutorials on the issue but they do not teach the coding part. Any help is appreciated.
I've attached the example ble code which I used for nRF.
Recep_BLE_notify.ino (3.32 KB)