I have encountered problems while extracting services from my local device. The local device is using multiple instances of the same service (e.g. Temperature) as it could perform multiple measurements.
I think this is currently not supported within the bluepy library. I tried to dig a little bit into the code. I observed that internally the services are stored within a _serviceMap that is indexed directly by the UUID:
(from bluepy/btle.py)
def discoverServices(self):
self._writeCmd("svcs\n")
rsp = self._getResp('find')
starts = rsp['hstart']
ends = rsp['hend']
uuids = rsp['uuid']
nSvcs = len(uuids)
assert(len(starts)==nSvcs and len(ends)==nSvcs)
self._serviceMap = {}
for i in range(nSvcs):
self._serviceMap[UUID(uuids[i])] = Service(self, uuids[i], starts[i], ends[i])
return self._serviceMap
Hence, if multiple instances exists with the same UUID, only the last instance will be reported by the bluepy library. This is also what I observed locally.
Unfortunately I don't have experience to judge if this can be changed easily. I guess it would be required to index the serviceMap with the handle of that service instead of the UUID itself, as the handle will be unique. At a fist glance, two methods would be affected if the _serviceMap would be indexed differently: def discoverServices(self): and def getServiceByUUID(self, uuidVal):.
Dear BluePy Team,
I have encountered problems while extracting services from my local device. The local device is using multiple instances of the same service (e.g. Temperature) as it could perform multiple measurements.
I think this is currently not supported within the bluepy library. I tried to dig a little bit into the code. I observed that internally the services are stored within a _serviceMap that is indexed directly by the UUID:
(from bluepy/btle.py)
Hence, if multiple instances exists with the same UUID, only the last instance will be reported by the bluepy library. This is also what I observed locally.
Unfortunately I don't have experience to judge if this can be changed easily. I guess it would be required to index the serviceMap with the handle of that service instead of the UUID itself, as the handle will be unique. At a fist glance, two methods would be affected if the _serviceMap would be indexed differently:
def discoverServices(self):anddef getServiceByUUID(self, uuidVal):.Best Regards, Thomas