def notifications(self, callback=None):
"""Toggle notifications/subscriptions to data signals
on the MetaWear board.
:param callable callback: The function to call when
data signal notification arrives. If ``None``, an
unsubscription to notifications is sent.
"""
data_signal = self.data_signal
if callback is not None:
if self._debug:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is not None:
raise PyMetaWearException(
"Subscription to {0} signal already in place!")
self.callback = (callback, Fn_DataPtr(callback))
libmetawear.mbl_mw_datasignal_subscribe(data_signal,
self.callback[1])
else:
if self._debug:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is None:
return
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self.callback = None
def notifications(self, callback=None):
"""Toggle notifications/subscriptions to data signals
on the MetaWear board.
:param callable callback: The function to call when
data signal notification arrives. If ``None``, an
unsubscription to notifications is sent.
"""
data_signal = self.data_signal
if callback is not None:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is not None:
raise PyMetaWearException(
"Subscription to {0} signal already in place!")
# Handle the context argument added in MetaWear C++ API 0.12.
callback = context_callback(callback)
self.callback = (callback, FnVoid_VoidP_DataP(callback))
libmetawear.mbl_mw_datasignal_subscribe(
data_signal, None, self.callback[1])
else:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is None:
return
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self.callback = None
def check_and_change_callback(self, data_signal, callback):
if callback is not None:
if self._debug:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if data_signal in self._callbacks:
raise PyMetaWearException(
"Subscription to {0} signal already in place!")
self._callbacks[data_signal] = (callback, Fn_DataPtr(callback))
libmetawear.mbl_mw_datasignal_subscribe(
data_signal, self._callbacks[data_signal][1])
else:
if data_signal not in self._callbacks:
return
if self._debug:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
del self._callbacks[data_signal]
def check_and_change_callback(self, data_signal, callback):
if callback is not None:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if data_signal in self._callbacks:
log.debug('Replacing callback for datasignal {0}...'.format(
data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self._callbacks.pop(data_signal)
callback = context_callback(callback)
self._callbacks[data_signal] = (callback, FnVoid_VoidP_DataP(callback))
libmetawear.mbl_mw_datasignal_subscribe(
data_signal, None, self._callbacks[data_signal][1])
else:
if data_signal not in self._callbacks:
return
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self._callbacks.pop(data_signal)
def check_and_change_callback(self, data_signal, callback):
if callback is not None:
if self._debug:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if data_signal in self._callbacks:
log.debug('Replacing callback for datasignal {0}...'.format(
data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self._callbacks.pop(data_signal)
self._callbacks[data_signal] = (callback, FnVoid_DataP(callback))
libmetawear.mbl_mw_datasignal_subscribe(
data_signal, self._callbacks[data_signal][1])
else:
if data_signal not in self._callbacks:
return
if self._debug:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self._callbacks.pop(data_signal)
print("New client created: {0}".format(c))
def switch_callback(data):
if (data.contents.type_id == DataTypeId.UINT32):
data_ptr = cast(data.contents.value, POINTER(c_uint))
if data_ptr.contents.value == 1:
print("Switch pressed!")
elif data_ptr.contents.value == 0:
print("Switch released!")
else:
raise ValueError("Incorrect data returned.")
else:
raise RuntimeError('Incorrect data type id: ' +
str(data.contents.type_id))
# Subscribe
data_signal = libmetawear.mbl_mw_switch_get_state_data_signal(c.board)
fcn_dptr = Fn_DataPtr(switch_callback)
libmetawear.mbl_mw_datasignal_subscribe(data_signal, fcn_dptr)
time.sleep(10.0)
# Unsubscribe:
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
time.sleep(1.0)
c.disconnect()