Hello,I'm using The BlueNRG-M2SP with the x-nucleo-BNRG2A1, and I wan't to send and receive ascii and hex, from the ble to my phone using "UART". I wan't to know if there is an example to use for this situation with or without flashing the BLE, Regards,

[abach.1]

I'm using : the X-Nucleo-bnrg2A1

A nucleo L476RG

and I already tried to Flash my bluetooth with the examples on the firmware ST BLUENRG DK, especially the DTM. And tried the BLE_chat but I can't see the bluetooth in my phone using BLE Scanner.

[Laurent LOUAZON]

Hello,

You should flash the BlueNRG-M2SP with BLE serial port from latest SDK BlueNRG-1_2 DK 3.2.3 available on st.com.

Of course, you should rebuilt BLE serial port example (server) with the proper pre processing option for M2SP (see DT0137).

Your BlueNRg-M2SP will then act as a BLE to UART bridge.

Regards

Laurent

[abach.1]

Thank you so much Laurent for your answer,

I've already flashed my x-nucleo-bnrg2a1 with the serial_port example from the latest SDK, but I can see the bluenrg on my phone to communicate with the module, I tried with BLE scanner and nrF connect.

The 0 ohm resistors that I soldered on my x-nucleo-bnrg2a are R87, R86, R73

and removed the R76 to properly communicate using UART pins.

My board works correctly i tried the st bluenrg GUI and it works using USB to UART

The problem I'm having now is that I cannot connect to my phone using the bluenrg

Thank you in advance

Anas

[Laurent LOUAZON]

Have you just flashed serial_port example or have you rebuilt the project to adpat it to M2SP as I wrote previously?

[abach.1]

Hello, yes it works but i'm not able to receive more than 20 bytes data on my characteristic

Anas

[Laurent LOUAZON]

Hi,

Good to read.

It should be logical as characteristic is defined with 20B.

Please keep in mind this is just a code example and you can adapt it (more characteristics or characteristic size)

Below is code showing 20 is defined.

ret = aci_gatt_add_char(SerialPortServHandle, UUID_TYPE_128, &char_uuid, 20, CHAR_PROP_NOTIFY, ATTR_PERMISSION_NONE, 0,

        16, 1, &TXCharHandle);

Regards

Laurent

[abach.1]

thank you Laurent for your response, meanwhile I tried to modify the char_value_length which is 20 to 124 by doing this : ret = aci_gatt_add_char(SerialPortServHandle, UUID_TYPE_128, &char_uuid, 124, CHAR_PROP_NOTIFY, ATTR_PERMISSION_NONE, 0,

        16, 1, &TXCharHandle); but when I flash the bluenrg M2SP, I cannot see it anymore on my phone

Regards

Anas

[Laurent LOUAZON]

Hello ,

You may also have to increase array size for attribute table (see below code from serialport_config.h

As can be seen here, we have a max of 80 defined for Rx and Tx size.

Increasing this value should allow you to increase characteristic size.

#define ATT_VALUE_ARRAY_SIZE  (44 + 80 + OTA_ATT_VALUE_ARRAY_SIZE) //(GATT + GAP) = 44 + serial port (TX (41) + RX (39) characteristics)  Services

Regards

Laurent

[abach.1]

Hello,

Thank you for your response,

I increased the array size for attribute table by doing

#define ATT_VALUE_ARRAY_SIZE  (44 + 496 + OTA_ATT_VALUE_ARRAY_SIZE) //(GATT + GAP) = 44 + serial port (TX (249) + RX (247) characteristics)  Services

becasue I wan't to send 124B,

I can see again the Bluetooth device on the BLE Scanner, but meanwhile the read characteristic doesn't surpass 20B,

Regards,

Anas