Basic ble reading for STM32WB

[Taxara]

Hi Guys,

I have problems reading. I have followed the STM32WB Workshop on stm32wb (using mx version 5.4.0). Now i'm trying to read but all examples seem to only use notifying and writing.

I have the following char created and added some default value.

aci_gatt_add_char(SvcHandle,
 UUID_TYPE_128, &uuid16,
 1,
 CHAR_PROP_READ | CHAR_PROP_WRITE_WITHOUT_RESP,
 ATTR_PERMISSION_NONE,
 GATT_NOTIFY_ATTRIBUTE_WRITE | GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP,
 10,
 0,
 &(AlarmThresholdHandle));
 
 
 uint8_t pData[1] = {59};
 aci_gatt_update_char_value(SvcHandle,
 AlarmThresholdHandle + 1,
 0, /* charValOffset */
 1, /* charValueLen */
 pData);

    

Within server app handler it enters this case when im reading, and found the right handler. This is the part where i get lost, what to do next? I implemented the following but that does not work.

case EVT_BLUE_GATT_READ_PERMIT_REQ:
 {
 aci_gatt_read_permit_req_event_rp0* attributeToRead;
 attributeToRead = (aci_gatt_read_permit_req_event_rp0*)blue_evt->data;
 
 if(attributeToRead->Attribute_Handle == AlarmThresholdHandle + 1)
 {
 
 uint8_t pData[1] = {5};
 
 retval = aci_gatt_update_char_value(SvcHandle,
 AlarmThresholdHandle + 1,
 0, /* charValOffset */
 1, /* charValueLen */
 pData);
 
 }
 returnValue = SVCCTL_EvtAckFlowEnable;
}

Once i passed here i cant trigger any new events anymore.

I would like to see some examples of reading or get some feedback on which steps to preform to read successfully.

Thanks in advance,

[Remi QUINTIN]

​You may have a look at  the blood presure project  here:

STM32Cube_FW_WB_V1.5.0\Projects\P-NUCLEO-WB55.Nucleo\Applications\BLE\BLE_Peripheral_Lite

The related characteristic has a READ property.

[JSHAR.1890]

Read request must always be completed with

(void)aci_gatt_allow_read(read_permit_req->Connection_Handle);

 switch(event_pckt->evt)
 {
 case EVT_VENDOR:
 {
 blue_evt = (evt_blue_aci*)event_pckt->data;
 
 switch(blue_evt->ecode)
 {
 	case EVT_BLUE_GATT_READ_PERMIT_REQ:
		{
 		read_permit_req = (aci_gatt_read_permit_req_event_rp0*)blue_evt->data;
			if(read_permit_req->Attribute_Handle == (aTemplateContext.TemplateReadClientToServerCharHdle + 1))
			{			
				memset(MsgResponse, 0x22, 87);
				ReadCount++;
		 HAL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);	
				(void)aci_gatt_allow_read(read_permit_req->Connection_Handle);	
				#if 1
				aci_gatt_update_char_value(aTemplateContext.TemplateSvcHdle,
				 aTemplateContext.TemplateReadClientToServerCharHdle,
				 0, /* charValOffset */
				 87, /* charValueLen */
				 (uint8_t *) MsgResponse);	
				 return_value = SVCCTL_EvtNotAck;
				#endif
			}
			break;
 	}

for example: See the code snipped below that I worked and found useful:

[Taxara]

Exactly where i was looking for, thanks!

[MKolo.2]

Hello,

I just read your post on how to send message usi g BLE in STM32. Can you please help me know where I can include my alue so that I may be able to send using BLE. Thank you in advance.

Regards,

M.K

[BScha.2]

Thanks, thats it...... and my Problem is past now ....