Ok.
pioarduino worked just fine in my setup.

Regards,
Sara

Thanks, Sara!

After installing the pioarduino extension, the error did not disappear. Had to dive deep into the BLE libraries and found the problem. The libraries used by Arduino IDE are different thae the ones used in PlatformIO. Comparing them I found that the offending function BLEScan::start(scanTime, false) was declared differently in the PlatformIO dependencies directory:
C:\Users\ben.platformio\packages\framework-arduinoespressif32\libraries\BLE\src\BLEScan.cpp

Before modification:

BLEScanResults BLEScan::start(uint32_t duration, bool is_continue) {
if(start(duration, nullptr, is_continue)) {
m_semaphoreScanEnd.wait(“start”); // Wait for the semaphore to release.
}
return m_scanResults;
} // start

After modification:

BLEScanResults *BLEScan::start(uint32_t duration, bool is_continue) {
if(start(duration, nullptr, is_continue)) {
m_semaphoreScanEnd.wait(“start”); // Wait for the semaphore to release.
}
return &m_scanResults;
} // start

Of course, the header in BLEScan.h had to be modified as well.

Now it compiles and works ok on the old version of the Espressif 32 platform.

I tried to install the new version, as per your latest tutorial, but run into trouble. After changing the platform line in the platformio.ini file, the system started resolving the esp32dev dependencies, but it seems to have gone into infinite loop somewhere:

Resolving esp32dev dependencies…
Platform Manager: Installing https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
Downloading 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Unpacking 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Nothing was happening for about 30 minutes, so I terminated the process.
I had to remove the pioarduino extension and reinstall the VS Code…
For now I will stick to the old Espressif32 platform.

Cheers,
Ben

Hi.
That is probably because VS Code + PlatformIO uses a deprecated version (version 2) of the ESP32 core.
To use the latest version, you need to use pioarduino (a fork of PlaformIO that supports the latest ESP32 core version).

We’ll publish a tutorial about that subject tomorrow. So, stay tuned.

Regards,
Sara

Compiling .pio\build\esp32dev\libac6\BLE\BLERemoteService.cpp.o
src/main.cpp: In function ‘void loop()’:
src/main.cpp:36:65: error: cannot convert ‘BLEScanResults’ to ‘BLEScanResults*’ in initialization
BLEScanResults *foundDevices = pBLEScan->start(scanTime, false);

Any ideas?

Great tutorial, worked fine first try with Android!

That said, what is the methodology to add/change(?) the messages that are sent to a phone?

I have a LoRa GPS tracking system that will send coordinates to a base station and when I press a button on the base station, I’d like to send that coordinate to the phone, either changing the current BLE characteristic (text, like: “46.0594760,-073.6241978”), or creating a new one.

Ideas?

Hi.
ADC2 pins cannot be used when Wi-Fi is used. So, if you’re using Wi-Fi and you’re having trouble getting the value from an ADC2 GPIO, you may consider using an ADC1 GPIO instead. That should solve your problem.
So, instead of GPIO 27, you can try using GPIO 32, for example.

Regards,
Sara

I’m having the same problem. Can you a bit more specific on your solution?

Got any reference? I also need this

Can you show how to code a speed test, especially one that uses the max data size allowed by BLE?

What happens if the connection is lost? How does the BLE client or server know that the connection was lost, and how does they know which packets were received OK (IOW, is there an ACK signal?)