BluetoothSerial uses 64% of available Flash

[StuartsProjects]

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Hardware:

Board: ESP32 Dev Module
Core Installation/update date: 08/jun/2016
IDE name: Arduino IDE
Flash Frequency: 40Mhz
Upload Speed: 115200

Description:

I wrote a simple 'Hello World' program to send out the text via Bluetooth Serial. The program works but uses rather a lot of memory;

Sketch uses 849303 bytes (64%) of program storage space. Maximum is 1310720 bytes.
Global variables use 74520 bytes (22%) of dynamic memory, leaving 253160 bytes for local variables. Maximum is 327680 bytes.

I have been converting a LoRa GPS tracker program across from Arduino Atmel code, adding the Bluetooth serial takes program flash size from around 17% to 70%

Is this expected behaviour ?

Using the libbt.a mod from 'BluetoothSerial silently drops bytes to be sent #1537'

Sketch:

//Change the code below by your sketch
#include <Arduino.h>
#include "BluetoothSerial.h"

BluetoothSerial SerialBT;

void setup() 
{ 
Serial.begin(115200);
SerialBT.begin("ESP32test"); //Bluetooth device name
Serial.println("The device started, now you can pair it with bluetooth!");
}

void loop()
{
SerialBT.println("Hello World");
delay(1000);
}

Debug Messages:

Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here 

[JamesGKent]

unfortunately the bluetooth protocol is horrifically complex, so the code required to implement it isn't small.
thats not saying this won't/can't be improved in future, but it is currently the state of things that adding in bluetooth functionality consumes large amounts of flash

[lbernstone]

There are partitioning schemes that support larger apps, and devices with 8MB and even 16MB flash are available. 640K of flash should be enough for anyone 😄

[StuartsProjects]

OK thanks for the info.

[Lingaperumal]

Hello
I have a doubt....regarding serial bluetooth..
if the device is not connected to server bluetooth how we can display or to tell that your device is not connected in a serial communication...

thanks in advance