Bad BLE connection

[aelghozi]

Hello,

I am trying to make the BLE Arduino library work. I tried with all versions of ESP32 packages but usually I'm using the 1.0.6. I'm using the BLE client example from the library. Here is the serial monitor output: 10:24:17.949 -> BLE Advertised Device found: Name: VR BOX, Address: ff:ff:20:01:b5:1e, serviceUUID: 00001812-0000-1000-8000-00805f9b34fb 10:24:17.949 -> Found VRBOX Server 10:24:17.949 -> Server has HID service 10:24:17.949 -> Forming a connection to ff:ff:20:01:b5:1e 10:24:17.949 -> - Created client 10:24:18.041 -> lld_pdu_get_tx_flush_nb HCI packet count mismatch (0, 1) 10:24:18.041 -> - Connected to server

The code seems to be stuck at this line: BLERemoteService* pRemoteService = pClient->getService(serviceUUID);

Then nothing... Sometimes it manages to connect but usually no. I also tried to modify the FreeRTOS.cpp file by using non infinite semaphores. I tried to replace xSemaphoreTake(m_semaphore, portMAX_DELAY); by xSemaphoreTake(m_semaphore, 15000UL);. Now it is not getting stuck at line BLERemoteService* pRemoteService = pClient->getService(serviceUUID); but the connection establishes one time each 10 times.

What can I do please ? Any help or idea will be appreciated !

[chegewara]

https://github.com/espressif/arduino-esp32/blob/master/libraries/BLE/src/BLEClient.h#L36-L37 Use this function instead: connect(BLEAdvertisedDevice* device); or this parameter esp_ble_addr_type_t type = BLE_ADDR_TYPE_PUBLIC should be BLE_ADDR_TYPE_RANDOM or something like that.

[aelghozi]

Thank you for the reply !

I didn't catch your point because the example of the BLE ESP32 Arduino library already shows pClient->connect(myDevice); in the bool connectToServer() function.

[aelghozi]

Which version of the ESP32 package do you recommend ?

[aelghozi]

Maybe we did not understand each other. I'm just trying to use the BLE_client.ino without any modification

[chegewara]

In that case its hard to say what may be the problem. Maybe it is problem with your code or maybe library.

[aelghozi]

In that case its hard to say what may be the problem. Maybe it is problem with your code or maybe library.

My code ? It is not my code, it is the example (BLE_client) of the ESP32 BLE library without any modification. I just put the correct UUID here: // The remote service we wish to connect to. static BLEUUID serviceUUID("4fafc201-1fb5-459e-8fcc-c5c9c331914b"); // The characteristic of the remote service we are interested in. static BLEUUID charUUID("beb5483e-36e1-4688-b7f5-ea07361b26a8");

[chegewara]

If it is example, then how would you like to find service with random UUID (which is in example) in your device, which is HID? It is completely different set of services and characteristics UUID. I cant help you with that,

[aelghozi]

It is not random, it is the UUIDs of my controller

[khalidnk83]

I had many issues using ESP32 BLE, then I switched to nimble ble.... SO far it is very good experience, try using it from the link: https://github.com/h2zero/NimBLE-Arduino.git