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 got same error with original SDK. Thank you

Hello,

Which SDK version was this? I used version 17.1.0 and did not encounter any of the problems you mentioned.

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 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,

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