Democode for PSoC6 BLE central reading value from custom service

[PeDo_1397011]

Hello,

my PSoC 6 acts  as a central, connects with a peripheral and try to read its data (array with 20 byte)

with

****************************************

cy_stc_ble_gattc_read_req_t   myVal;

printf("Start reading\n\r");

myVal.attrHandle = cy_ble_customCServ[CY_BLE_CUSTOMC_HEAT_COST_ALLOCATOR_SERVICE_SERVICE_INDEX].customServChar[CY_BLE_CUSTOMC_HEAT_COST_ALLOCATOR_SERVICE_SENSORDATA_CHAR_INDEX].customServCharHandle[0];

myVal.connHandle = cy_ble_connHandle[0];

while(Cy_BLE_GATTC_ReadCharacteristicValue(&myVal ) != CY_BLE_SUCCESS);

    printf("BLE GATTC read success\n\r");

*********************************************

This works without error, but where is the data?

How to connect my empty array with the result of Cy_BLE_GATTC_ReadCharacteristicValue() ?

I found only one Example for an PSoC6 Central which writes data to an peripheral.

Do you have a democode for using this function ?

Thanks for help!

[Yugandhar · Accepted solution]

Hello Peter,

After calling the function Cy_BLE_GATTC_ReadCharacteristicValue()  Internally, Read Request is sent to the peer GATT Server. If the read operation is successful, GATT Server sends a Read Response. This response results in CY_BLE_EVT_GATTC_READ_RSP event at GATT Client's end. This event indicates that the 'Read Response' is received from GATT Server device. The event parameter is a pointer to a structure of type cy_stc_ble_gattc_read_rsp_param_t where we can get the actual value.

struct cy_stc_ble_gattc_read_rsp_param_t.

Read response parameter type received from server. 

Data fields:

   cy_stc_ble_gatt_value_t    value

                                Attribute Value.

  cy_stc_ble_conn_handle_t connHandle

                              Connection handle.

Thanks,

P Yugandhar.