select the MIDI device to be a Client or a Server at Power ON

[jhsa]

Hi, would it be possible to initialize an ESP32 as a client or as a server when powering the board ON, and for example by pressing a button?
At the moment I don't see how I could do it, but I am a beginner.
Thanks in advance for your answers.

João

[cyberdevnet]

Hi!
Any update about this? Does someone know how do it?

[lathoub]

Not really a BLE-MIDI question, but rather an Arduino platform question (hence why you don't see an answer here).

Having Client or Server code based on a 'press of a button' means that the instance of the client (or server) class needs to be done dynamically, rather than (typically) statically on the stack (you can't allocate both during compile time and then, based on a key-press activate one of the other). Dynamically allocating memory (using new()) can lead to heap fragmentation and ultimately have the device to crash on embedded systems. This is also the reason why the underlying lib is totally C++ template based, even avoiding the use of v-tables.

So your options are (after a quick reflection):

• dynamically allocate (and risk heap fragmentation and associated issues)
• your own bootloader, that listens for the 'press the button' and then further boots either client or server (no clue how to do this)
• use other hardware, with an OS that have better mem management.

[jhsa]

Wouldn't be possible to do something like for example:

void setup() {
if (Select_BLE_type == 0) BLEserver.begin();
if (Select_BLE_type == 1) BLEclient.begin();
}