ble_app_interactive using gatt to send command

Hello,

Did you do the service discovery first?

e.g.

$ scan on

$ connect <device address>

$ gatt services <device address> /* Discover all primary services */

$ gatt characteristics <device address> 1 /* Discover the characteristics for the NUS service (16-bit UUID = 0x0001)

$ gatt write command <device address> 2  1 /* Write '1' (i.e. 0x31) to NUS RX characteristic 0x0002  */

Best regards,

Vidar

Hello,

I solved the upper question by editting MAX_SERVICES_COUNT and MAX_CHARACTERISTICS_COUNT.

But there is a new problem when I type gatt services <device address>.

It shows 

uart_cli:~$ gatt services F9:28:E7:D2:F5:5B
gatt services F9:28:E7:D2:F5:5B
<error> app: Fatal error
<warning> app: System reset

and reset the firmware.Is there anything I can fix it?

Thank you

Hello,

Thanks for the reply.

Now I get more message.

It shows

uart_cli:~$ gatt services F9:28:E7:D2:F5:5B
gatt services F9:28:E7:D2:F5:5B
<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at D:\Keil_v5_1\nRF5_SDK_17.1.0_ddde560\ examples\ble_central_and_peripheral\experimental\ble_app_interactive\ble_m.c:105 2
PC at: 0x0003CB61
<error> app: End of error report

Thank you

Hello,

Thanks. So the NO_MEM error is returned by the sd_ble_uuid_vs_add() call. This means you have to increase the size of the vendor specific UUIDs buffer in the Softdevice to allow the app to buffer all the UUIDs from your GATT server . The buffer size is adjusted through the NRF_SDH_BLE_VS_UUID_COUNT setting in sdk_config.h

Hello,

I have modified NRF_SDH_BLE_VS_UUID_COINT setting in sdk_config.h.

But when I modify the number to 4 or more ,it shows these message.

<warning> nrf_sdh_ble: Insufficient RAM allocated for the SoftDevice.
<warning> nrf_sdh_ble: Change the RAM start location from 0x200079E0 to 0x200079F0.
<warning> nrf_sdh_ble: Maximum RAM size for application is 0x38610.
<error> nrf_sdh_ble: sd_ble_enable() returned NRF_ERROR_NO_MEM.
<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at D:\Keil_v5_1\nRF5_SDK_17.1.0_ddde560\examples\ble_central_and_peripheral\experimental\ble_app_interactive\ble_m.c:1713
PC at: 0x0003DC13
<error> app: End of error report

Thank you

Hello,

Sorry, I forgot to add that you may also have to allocate more RAM the Softdevice to support the larger UUID buffer. This is done through the linker configurations here:

You will need to change RAM_START from 0x200079E0 to 0x200079F0, and RAM_SIZE to 0x38610 as suggested by the log output.

Hello,

Thanks for the reply, it works.

But there is still a question, when I use nRF Connect , I see below services.

When I use putty and type gatt services <MAC address>

I can see 1800 1801 both on PC and nRF connect,but I can only see like UUID 5E5F428E-42EF-428B-AA09-955D99B3780E on nRF connect.

Is there something I can modify that I will be able to see long UUID on PC?

Thank you

Hello,

Thanks for the reply, it works.

But there is still a question, when I use nRF Connect , I see below services.

When I use putty and type gatt services <MAC address>

I can see 1800 1801 both on PC and nRF connect,but I can only see like UUID 5E5F428E-42EF-428B-AA09-955D99B3780E on nRF connect.

Is there something I can modify that I will be able to see long UUID on PC?

Thank you

Hello,

It is possible to print the full 128 bit uuid instead of the 16 bit short form, but it is not supported by the current implementation so you will have to modify the example if you want to achieve this. The UUIDs are received through the on_read_rsp() callback in ble_m.c when you start service discovery with the "gatt services <address>" command.