RE: Bluetooth value reading and writing problem.

aliyolcu28 — Tue, 08 Oct 2019 13:51:46 GMT

i will try and return. thanks

RE: Bluetooth value reading and writing problem.

Simon — Tue, 08 Oct 2019 13:24:45 GMT

I modified the ble ble_nus_init(..) function in the ble_nus.c library in the following manner:

memset(&add_char_params, 0, sizeof(add_char_params));
    add_char_params.uuid                     = BLE_UUID_NUS_RX_CHARACTERISTIC;
    add_char_params.uuid_type                = p_nus->uuid_type;
    add_char_params.max_len                  = BLE_NUS_MAX_RX_CHAR_LEN;
    add_char_params.init_len                 = sizeof(uint8_t);
    add_char_params.is_var_len               = true;
    add_char_params.char_props.write         = 1;
    add_char_params.char_props.write_wo_resp = 1;

    add_char_params.char_props.read         = 1; //Added
    add_char_params.char_props.notify = 1;       //Added


    add_char_params.read_access  = SEC_OPEN;
    add_char_params.write_access = SEC_OPEN;
    add_char_params.cccd_write_access = SEC_OPEN; //Added

    err_code = characteristic_add(p_nus->service_handle, &add_char_params, &p_nus->rx_handles);

I modified the RX characterstics, but you can change to UUID to whatever you would like
Now you are able to read from it and write to it (with and without response)
In order to notify the characteristic value to a central device, you need to use the function sd_ble_gatts_hvx(..)
- Tell me if you want to elaborate more on this function
I would recommend you to not modify the ble_nus.c library directly, but instead create a copy (e.g. ble_nus2.c) since you may want to use this library with other projects, then you include the copied library in the Project Explorer window as shown below:

Best regards,

Simon

RE: Bluetooth value reading and writing problem.

aliyolcu28 — Tue, 08 Oct 2019 05:38:14 GMT

Yes, I want to create a UUID that contains exactly NOTIFY, READ, WRITE and WRITE NO RESPONSE, and send and receive data over this ID.

RE: Bluetooth value reading and writing problem.

Simon — Mon, 07 Oct 2019 12:26:14 GMT

Do I understand you correctly? You want to create a single characteristic with the properties NOTIFY, READ, WRITE and WRITE NO RESPONSE?

Best regards,

Simon