Renaming the device name of CC2541

Javahar Ragothaman24

Hi,

I wanted to make my peripheral device name user configurable from the client application (eg BLE device monitor).

Say example if an user has 10 SensorTag BLE devices, he should be reconfigure the device name to SensorTag1, SensorTag2 etc or SensorTagA, SensorTagB etc from Windows or Android based the client APP.

I made the below changes

// GAP GATT Attributes

static uint8 attDeviceName[GAP_DEVICE_NAME_LEN] = "My Device";

uint8 devNamePermission = GATT_PERMIT_READ|GATT_PERMIT_WRITE;

// Set the GAP Characteristics

GGS_SetParameter( GGS_W_PERMIT_DEVICE_NAME_ATT, sizeof ( uint8 ), &devNamePermission );

GGS_SetParameter( GGS_DEVICE_NAME_ATT, sizeof(attDeviceName), attDeviceName );

I edited the Device_Name characteristics (@ Generic Access Profile Service) from BLE Device Monitor Android App as "My new device".

But, this changed value is not persistent. After device restarts, its showing the old value "My Device". Am I doing anything wrong here? Please help me.

Javahar

over 10 years ago

0 Sunny Bhayani over 10 years ago

Expert 1730 points

Hi Javahar,

You need to use the osal_svn_read and osal_svn_write APIs.

Because the attDeviceName variable is a static variable i.e. until the device Resets, i.e. the FW is reloaded, it will retain the value assigned to it.

Once FW is rebooted, it will retain the original value assigned to it, in your case, "My Device".

Thanks,
Sunny

0 Javahar Ragothaman24 over 10 years ago in reply to Sunny Bhayani

Prodigy 60 points

Hi Sunny,

Thanks for your reply. How should I handle that in FW code? Do I have to create a new characteristics?

Thanks,

0 Sunny Bhayani over 10 years ago in reply to Javahar Ragothaman24

Expert 1730 points

One way you can achieve it is, when you update the attDeviceName from Central Device, you should also store the new name to NVM. Then in your app_init(), you can read the name from the NVM and update the attDeviceName.

Just one possible solution.

0 Javahar Ragothaman24 over 10 years ago in reply to Sunny Bhayani

Prodigy 60 points

Hi Bhayani,

Any pointers on the same? I tried different ways. But didn't get any clue.

Thanks,
Javahar.R

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Renaming the device name of CC2541