Unable to write to peripheral

[nejcokle]

Hi,

I use sd_ble_gattc_write function to write to my peripheral with my central device. I'm sure the settings should be right but i still can't see any change on peripheral. If i connect with my mobile app i can write normally.

Peripheral is write with no response only.

My code to write characteristic:

static uint32_t writeChar (uint16_t peripheral_id,uint8_t *zelVrednost)
{
    uint32_t                 error_code   = NRF_ERROR_NOT_FOUND;
    ble_gattc_write_params_t write_params = {0};


	LOG_INFO("CHAR HANDLE WRITE: 0x%04x",gs_peripheral[peripheral_id].value_handle);

write_params.write_op = BLE_GATT_OP_WRITE_REQ;
write_params.handle = gs_peripheral[peripheral_id].value_handle;
write_params.offset = 0x0000;
write_params.len = sizeof(zelVrednost);
write_params.p_value = zelVrednost;


	LOG_DEBUG("vrednost: 0x%02x\r\n", *write_params.p_value);
if ((error_code = sd_ble_gattc_write(gs_peripheral[peripheral_id].conn_handle, &write_params)) != NRF_SUCCESS)
{
		LOG_DEBUG("(Peripheral %i) Error: 0x%x", peripheral_id, error_code);
    return error_code;
}
	else
	{
		LOG_DEBUG("Success\r\n");
	}
return error_code;
}

I set my handle when i discover service and characteristic, with this line:

gs_peripheral[peripheral_id].value_handle = gsp_ble_evt->evt.gattc_evt.params.char_disc_rsp.chars[i].handle_value;

[Carles]

Peripheral is write with no response only.

In that case you should be using:

BLE_GATT_OP_WRITE_CMD

instead of:

BLE_GATT_OP_WRITE_REQ

Carles

[Hung Bui]

@nejcokle: please create separate cases for different questions. Your question on just work pairing is not quite related to the original question.

If you have fixed the issue, please accept the answer from Carles or create your own answer that explain how you solved it.

This would help other member if they face the same issue.