how to use sd_ble_uuid_vs_add in python

[Miha]

Hello,

I am programing a central role device in Python, with nRF51-BLE-Driver for windows. I want to discover custom 128 UUID services. For that i need to call the sd_ble_uuid_vs_add function ( base on this topic devzone.nordicsemi.com/.../ ) But how should I use it?

If I try this

uuid_list = [213, 127, 254, 99, 205, 147, 235, 163, 14, 74, 172, 83, 1, 0, 162, 186]
uuid_pointer = 0
ble_driver.sd_ble_uuid_vs_add(uuid_array, uuid_pointer)

I get: TypeError: in method 'sd_ble_uuid_vs_add', argument 1 of type 'ble_uuid128_t const *'

If I try to create ble_uuid128_t const *

srvc_uuid128 = ble_driver.ble_uuid128_t()
srvc_uuid128.uuid128 = util.list_to_uint8_array(uuid_list)

I get: TypeError: in method 'ble_uuid128_t_uuid128_set', argument 2 of type 'unsigned char [16]'

What is the correct way to use sd_ble_uuid_vs_add function in python?

[Leon Woestenberg]

This no longer seems to work like this. When I change the heart_rate_collector.py example:

def connect_and_discover(self):

uuid_list = [ 0x12, 0x34, 0x56, 0x78, 0xe4, 0x2f, 0x42, 0x98, 0xd6, 0x44, 0xb6, 0x1b, 0x00, 0x00, 0xdf, 0xc8 ]
uuid_array = util.list_to_uint8_array(uuid_list)

srvc_uuid128 = self.adapter.driver.ble_uuid128_t()
srvc_uuid128.uuid128 = uuid_array.cast()

uuid_type_pointer = self.adapter.driver.new_uint8()

bself.adapter.driver.sd_ble_uuid_vs_add(srvc_uuid128, uuid_type_pointer)

uuid_type = self.adapter.driver.uint8_value(uuid_type_pointer)


self.adapter.driver.ble_gap_scan_start()

I get:

  File "./my_file.py", line 80, in connect_and_discover
    srvc_uuid128 = self.adapter.driver.ble_uuid128_t()
AttributeError: 'BLEDriver' object has no attribute 'ble_uuid128_t'

Also, I see another function ble_vs_uuid_add:

def ble_vs_uuid_add(self, uuid):

assert isinstance(uuid, BLEUUID), 'Invalid argument type'
uuid_type = driver.new_uint8()

err_code = driver.sd_ble_uuid_vs_add(self.rpc_adapter,
                                     uuid.uuid128_to_c(),
                                     uuid_type)
if err_code == driver.NRF_SUCCESS:
    uuid.type = driver.uint8_value(uuid_type)
return err_code 

but I am still figuring out how that expects the UUID to be given. My current best estimate (I am not a Python programmer) is this:

uuid_list = [ 0x12, 0x34, 0x56, 0x78, 0xe4, 0x2f, 0x42, 0x98, 0xd6, 0x44, 0xb6, 0x1b, 0x00, 0x00, 0xdf, 0xc8 ]

self.adapter.driver.ble_vs_uuid_add(BLEUUID(uuid_list))

[Darrew]

Hi Bjørn, could you please elaborate on your last comment, I mean:

1. how to use the "new" python bindings (pc-ble-driver-py; which revision?) to register a custom 128 bit UUID. Furthermore:
2. has the adapter a way (method?) to register a custom UUID? In 0.9.1, I do not see any.
3. Using driver.ble_vs_uuid_add() seems to work for me (able to discover custom Services and Chars); but after adapter.service_discovery(conn, myuuid) with myuuid a instance of BLEUUID with custom BLEUUIDBase, the object a=adapter.db_conns[conn].services[x].uuid.base returns a instance BLEUUIDBase but attribute a.base is None. In all, does the driver update a.base at all? Please, enumerate answers 1),2) and 3). Thanks