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,

I used 17.0.2 version, thank you.

Hello,

OK, please try the same with 17.1.0, or debug your current project to get more error information.

Hello,

I have tried 17.1.0,but I got the same error message.

I have modified MAX_SERVICES_COUNT and MAX_CHARACTERISTICS_COUNT to 20,is there any problem if I set the number too large?

Thank you. 

Hello,

I see, so I assume your NUS device must have more 6 services which is the default for MAX_SERVICES_COUNT. It's fine to increase these settings. You will just get a linker error if you set them way too large and run out of RAM.

Hello,

Thanks for reply.

Now I have tried sdk 17.1.0 and tried gatt services MAC address.

But there is still a problem exist.System reset and disconnect, no characteristics show.

Here is the command I sent

uart_cli:~$ connect F9:28:E7:D2:F5:5B
connect F9:28:E7:D2:F5:5B
<info> app: CENTRAL: Connecting...
Connected to address: F9 28 E7 D2 F5 5B
<info> app: CENTRAL: Connected, handle: 0.
Current MTU: 128
MTU changed successfully
<info> app: Data length updated to 27 bytes.
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

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Thank you.

Hello,

Thanks for reply.

Now I have tried sdk 17.1.0 and tried gatt services MAC address.

But there is still a problem exist.System reset and disconnect, no characteristics show.

Here is the command I sent

uart_cli:~$ connect F9:28:E7:D2:F5:5B
connect F9:28:E7:D2:F5:5B
<info> app: CENTRAL: Connecting...
Connected to address: F9 28 E7 D2 F5 5B
<info> app: CENTRAL: Connected, handle: 0.
Current MTU: 128
MTU changed successfully
<info> app: Data length updated to 27 bytes.
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

BLE app with command line interface example started.
Press Tab to view all available commands.

Thank you.

Hello,

Please try again with the "Debug" configuration. This will replace the "fatal error" message with a more detailed crashlog that will point to the actual error.

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.