Incoming message Outgoing message

[hannoverRed]

Hello everyone,

could you get the function that if you send a message to the node, it doesn't output a message. but only a message output if no input value came before?

lg

[msillano]

This cannot be a general rule: many DPs change on their own under various circumstances.

But it is easy do it for some DPs, if required, using 2 more nodes. Example:

1. device output: Strore in the flow the reponse msg, e.g. in 'last-data': flow.set("last-data", msg);
2. device input: Test 'last-data' before to send any message: if (env.get('last-data' ) === undefined) send(message).

So the message is sent to device one and only one time.

Enjoy

[hannoverRed]

do you have an example flow?

[msillano]

Code function node 'check':

if (flow.get("last data"))
    return null;
return msg;

Code function node 'store'

//example:  only for DP 5
if(msg.payload.data.dps[5])
   flow.set("last-data", msg);
return msg;

enjoy m.s.

[hannoverRed]

Hi, thanks for the tip. but that doesn't change the value. True False

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