(2020-01-26, 07:48 PM)craig Wrote: I have the payload from the SignalK value as the following in a node red flow, but I am not sure how to separate them into two separate values to perform some calculations on them.

Code:

object
roll: -0.0008377580640000001
pitch: -0.0005061454970000001
yaw: null

When I use the split node, I get the values, but lose the "roll" and "pitch" names from the subsequent outputs

Code:

1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : number
-0.000785398185
1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : number
0.00022689280900000004
1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : null
null

I tried to use a "change" to delete roll and pitch from the message in two different change nodes to branch the thread message payloads, but that failed. 

Could someone point me in the right direction on the best way to pull the values from the payload? I would also like to do this with the long/lat position values once I get it working.

(2020-01-29, 01:38 PM)Moeritsen Wrote:

(2020-01-26, 07:48 PM)craig Wrote: I have the payload from the SignalK value as the following in a node red flow, but I am not sure how to separate them into two separate values to perform some calculations on them.

Code:

object
roll: -0.0008377580640000001
pitch: -0.0005061454970000001
yaw: null

When I use the split node, I get the values, but lose the "roll" and "pitch" names from the subsequent outputs

Code:

1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : number
-0.000785398185
1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : number
0.00022689280900000004
1/26/2020, 7:27:13 PMnode: b92f2e27.99214
navigation.attitude : msg.payload : null
null

I tried to use a "change" to delete roll and pitch from the message in two different change nodes to branch the thread message payloads, but that failed. 

Could someone point me in the right direction on the best way to pull the values from the payload? I would also like to do this with the long/lat position values once I get it working.

Hi Craig,

I had the same problem: My approach has been to parse the incoming SignalK sentence into a json-object. You may use the json-parser-node. After that you can access every value inside the incoming object like this:

msg.payload = msg.payload.updates[0].values[2].value;

if the upper objectlevel is called "updates" or different doesnt matter.

I produced a little video for explaination, but its in german: https://www.youtube.com/watch?v=UgLgrTWe77o

Hope this will help you

Moeritsen