async def read(self, parameters):
self.logger.debug("read")
request = ua.ReadRequest()
request.Parameters = parameters
data = await self.protocol.send_request(request)
response = struct_from_binary(ua.ReadResponse, data)
self.logger.debug(response)
response.ResponseHeader.ServiceResult.check()
# cast to Enum attributes that need to
for idx, rv in enumerate(parameters.NodesToRead):
if rv.AttributeId == ua.AttributeIds.NodeClass:
dv = response.Results[idx]
if dv.StatusCode.is_good():
dv.Value.Value = ua.NodeClass(dv.Value.Value)
elif rv.AttributeId == ua.AttributeIds.ValueRank:
dv = response.Results[idx]
if dv.StatusCode.is_good() and dv.Value.Value in (-3, -2, -1, 0, 1, 2, 3, 4):
dv.Value.Value = ua.ValueRank(dv.Value.Value)
return response.Results
async def read_value_rank(self):
"""
Read and return ValueRank attribute of node
"""
res = await self.read_attribute(ua.AttributeIds.ValueRank)
return ua.ValueRank(res.Value.Value)
