Node-red msg.payload.toString() not working

Tushar Patil

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Apr 29, 2017, 7:55:24 AM4/29/17

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Hello all,

i passed the value via function to base64 node for decoding but i don't know how to access the generated output inside next function?

When i try to perform any action on msg.payload such as substr or anything it throws error saying substr() or charAt() is not a function.

my input function(node) to base64 node :

**********************************************************

var msg1 = {

payload: msg.payload.data

};

return msg1;

**********************************************************

can you please help me?

Thank you.

Tushar patil

Nick O'Leary

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Apr 29, 2017, 8:16:35 AM4/29/17

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That suggests msg.payload isn't a String.

If you pass it to a debug node, you'll be able to see exactly what type of data you have and you can progress from there.

Nick

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Tushar Patil

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Apr 29, 2017, 8:25:41 AM4/29/17

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Thanks nick for reply ,

When i pass it to debug node i get msg.payload : buffer [4]

so to parse that i used

***********************************************

var msg1 = msg.payload.toString('utf8')

return msg1;

***********************************************

it throws TypeError: Cannot assign to read only property '_msgid' of '�)

how to perform substr n all function on buffer type?

Nick O'Leary

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Apr 29, 2017, 8:27:34 AM4/29/17

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You need to return a message object, not just the result of the toString.

msg.payload = msg.payload.toString('utf8');
return msg;

Nick

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Tushar Patil

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Apr 29, 2017, 8:33:26 AM4/29/17

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Hi nick ,

i did as you suggested but i am getting garbage value ,

can you please check the image i have attached.?

Screenshot (26).png

Nick O'Leary

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Apr 29, 2017, 8:41:27 AM4/29/17

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What do you expect the toString to result in?

You have a buffer containing the values 0x00, 0x27, 0xa0 and 0x29. If you interpret that as utf-8 characters you will get exactly what you see.

Nick

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Tushar Patil

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Apr 29, 2017, 8:45:06 AM4/29/17

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I want to perform substr() on that value thats why i was trying to convert it to string first.

i wanted the same output as it is in the buffer such as "0027a030".

Nick O'Leary

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Apr 29, 2017, 8:46:59 AM4/29/17

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I suggest you look up what functions are available on Buffer objects to do those sorts of operations. Converting it to a string first is a needless step.

Nick

On Sat, 29 Apr 2017, 13:45 Tushar Patil, <patil.t...@gmail.com> wrote:

I want to perform substr() on that value thats why i was trying to convert it to string first.

i wanted the same output as it is in the buffer such as "0027a030".

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Colin Law

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Apr 29, 2017, 9:05:44 AM4/29/17

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Can you explain what end result you want to get out? Are you trying to
get a section of the buffer as another buffer or do you actually want
a string consisting of a character representation of the hex values of
a section of the buffer, or what? It would also be useful to know what
you want to do with the result.

Colin

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Tushar Patil

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Apr 29, 2017, 9:21:44 AM4/29/17

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so i want character "a" from " 0027a029" (this is in buffer)

so i performed :

************************************************

msg.payload = msg.payload.slice(2,3);

return msg;

********************************************

so i am getting output ("a0") (and output is in buffer again)

which is not expected .

if the whole thing was in string then it would've been easier to performed next actions such as split (),substring()

What should i do ?

Julian Knight

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Apr 29, 2017, 9:45:57 AM4/29/17

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I think Colin is suggesting you tell us why you need the "a" from that buffer. Perhaps if you described where the info comes from? There may be a much better way to obtain what you want.

Tushar Patil

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Apr 30, 2017, 2:55:09 AM4/30/17

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ok...

Data is coming from MQTT node which is encoded so i'll tell you my flow

MQTT -> json -> function -> base64 -> function ....

to decode the data i am passing it to base64 node which decodes it in buffer type then on decoded data i have to do some parsing based on character in my case its "a" so i am trying to get that "a" from my data "0027a029" to compare it in next function. thats why i am asking how to perform those actions on it?

clear enough?

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Colin Law

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Apr 30, 2017, 3:28:03 AM4/30/17

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For the your example 0027a029 what is it that is coming from MQTT and
the first function node?

Colin

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Tushar Patil

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Apr 30, 2017, 3:31:49 AM4/30/17

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its sensor data.

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Colin Law

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Apr 30, 2017, 3:35:18 AM4/30/17

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I meant what is the data in detail for that example, from MQTT and the
first function node? I am particularly confused about why you are
feeding a string into the base64 node to get a binary buffer out.

Colin

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Tushar Patil

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Apr 30, 2017, 3:37:48 AM4/30/17

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its encoded in base64

"data":"B5PAVA=="

so to get data i am decoding it in hex thats why i am passing it to base64 node.

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Tushar Patil

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Apr 30, 2017, 3:38:54 AM4/30/17

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code of function node which is passing data to base64 node

var msg1 = {

payload: msg.payload.data

};

return msg1;

Colin Law

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Apr 30, 2017, 4:04:57 AM4/30/17

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OK, understood.

What do you get if in your final function node you use
msg.payload.toString('hex');

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Tushar Patil

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Apr 30, 2017, 4:15:31 AM4/30/17

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i get the decoded string ...i have attached the screenshot please check.

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Screenshot (27).png

Tushar Patil

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*Sorry decoded output in buffer not string

Colin Law

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I meant you to assign the value to something. So something like
msg1 = {payload: msg.payload.toString('hex')};
return msg1;

Colin

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Tushar Patil

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Apr 30, 2017, 4:33:38 AM4/30/17

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@ Colin Law thank you so much.

i wanted string and i got the string from that.

Now i cant perform javascript functions..

Thank you.Appreciate it.

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Colin Law

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I think you should be able to remove the base64 node and do the whole
thing in one function.

First try
msg1 = Buffer.from(msg.payload, 'base64');
return msg1;
and make sure you get the buffer out (the same as the base64 node gave)

If that works then change it to

msg1 = {payload: Buffer.from(msg.payload, 'base64').toString('hex')};
return msg1;

Colin

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Tushar Patil

unread,

Apr 30, 2017, 5:05:17 AM4/30/17

to node...@googlegroups.com

ok..i'll try this optimisation .

Thank you

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