Function tried to send a message of type boolean
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Leif Neland
Nov 21, 2017, 8:12:00 AM11/21/17
to Node-RED
Wanted:
When IP changes from non-pingable (ping node returns boolean false) to pingable (ping node returns number) send true (once)
But the function "return msg.payload>=0" gives this error:
"Function tried to send a message of type boolean"
Yeah? That's the general idea: True of pingable, false if not.
Then into rbe to only send changes along, then into switch to send only true along.
What is the problem?
[
{
"id": "f14a2b71.c397b8",
"type": "ping",
"z": "280fd4cd.e0f79c",
"name": "",
"host": "192.168.1.110",
"timer": "5",
"x": 150,
"y": 613,
"wires": [
[
"496dc9a4.d21688"
]
]
},
{
"id": "496dc9a4.d21688",
"type": "function",
"z": "280fd4cd.e0f79c",
"name": "(msg.payload)>0;",
"func": "\nreturn (msg.payload)>0;",
"outputs": 1,
"noerr": 0,
"x": 357,
"y": 612,
"wires": [
[
"187e1fd5.eaa1c"
]
]
},
{
"id": "187e1fd5.eaa1c",
"type": "rbe",
"z": "280fd4cd.e0f79c",
"name": "",
"func": "rbe",
"gap": "",
"start": "",
"inout": "out",
"x": 532,
"y": 612,
"wires": [
[
"e8257bf4.8f1f28"
]
]
},
{
"id": "e8257bf4.8f1f28",
"type": "switch",
"z": "280fd4cd.e0f79c",
"name": "",
"property": "payload",
"propertyType": "msg",
"rules": [
{
"t": "true"
}
],
"checkall": "true",
"outputs": 1,
"x": 680,
"y": 612,
"wires": [
[
"25f00ac6.5d0656"
]
]
}
]
Colin Law
Nov 21, 2017, 8:51:35 AM11/21/17
to node...@googlegroups.com
As the error says you have returned a value from the function instead of a valid message. Functions must always return objects not values, so you could use something like
msg.payload = (msg.payload>=0);
return msg;msg.payload = (msg.payload>=0);
or
return {payload: msg.payload}
The former is generally preferred as it is more effecient to pass on an existing message rather than make a new one.
Note that you can do this in a Change node.
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