Hello everyone,<\/p>\n
We were recently asked how an Open Source Rule can address a case of repeating fields such as ZigBee Home Automation Attributes.<\/p>\n
A ‘normal’ field in a message appears only once.<\/p>\n
The Network Layer Frame Type appears only once in a message.<\/p>\n
Therefore in an Open Source Rule we can access this field by using:<\/p>\n
packet.Field(“NwlHeaderFctlFrameType”).Value (or any other desired property of the field such as meaning, hint etc.).<\/p>\n
However, some fields may be included in a message more than once.<\/p>\n
For example, the following message is ZigBee Home Automation Shade Cluster – Read Attribute Response.<\/p>\n
It holds 3 attributes: Physical Closed Limit (PCL), Motor Step Size (MSS) and Closed Limit (CL).<\/p>\n
Assume that we want to see if a message contains the Closed Limit attribute, and if it does, see what its value is.<\/p>\n
Using the packet.Field(“ProfileCmdAttributeId”).Meaning will not work in this case, because this variable can hold only one out of the three attributes.<\/p>\n
In this case what we need to do is the following:<\/p>\n
The variable packet.Field(“ProfileCmdAttributeId”).Meanings hold a list of three elements (for this example) with the values “PCL”, “MSS” and “CL”.<\/p>\n
We should add this into a List<string> variable,<\/p>\n
List<string> attributeIds = packet.Field( “ProfileCmdAttributeId”).Meanings;<\/p>\n
we can also store all attributes values in another list<\/p>\n
List<long> attributeValues = packet.Field(“ProfileCmdAttributeDataValue).Values;<\/p>\n
And see if any of its elements contain the attribute we are looking for:<\/p>\n
if (attributeIds .Contains(“CL”))<\/p>\n
If it does, we need to find the relevant attribute number:<\/p>\n
int value = (int)attributeValues[attributeIds.IndexOf(“CL”)];<\/p>\n","protected":false},"excerpt":{"rendered":"
Hello everyone, We were recently asked how an Open Source Rule can address a case of repeating fields such as ZigBee Home Automation Attributes. A ‘normal’ field in a message appears only once. The Network Layer Frame Type appears only once in a message. Therefore in an Open Source Rule we can access this field […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-1843","post","type-post","status-publish","format-standard","hentry","category-blog"],"yoast_head":"\n