Beginner - Sending mulitple AT commands in sequence to a serial interface (raspberry pi with USB dongle)

General
1

Hi .. I am new to both Node-RED and the forum..
I am kind of stuck and hoping someone can send me in the right direction -
Setup - Raspberry Pi 3 - LTE USB dongle
Due to lack of internet in the house I am setting the node red up - I would like to send SMS trough a USB dongle..
And I am able to now. By first using a function to send payload

var num = "+45xxxxxxxx";
var at_cmd = "AT+CMGS=\""+num+"\""; 
msg.payload=at_cmd+"\r";
return msg;

Then insert a delay for 2 seconds . and then using function to send the second payload

var sms_msg = "Temperature low";
msg.payload=sms_msg+"\x1A";
return msg;

This is working fine.

But when I would like to add a second number to send a SMS to in parallel with the one above - then I am not in control of the sending of AT commands to the USB interface - and ending up getting ether errors or mixing the at commands - so i'll include the "at_cmd+" from sequence1 as text in the sequence2 SMS

The question - what would be best practice - set some kind of flag in the sequence1 to stop sequence2 - or a switch node before the serial interface?

BR Jan Eriksen

2

Hi and welcome.

I am confused by what you mean "to send a SMS to a parallel with the one above".

parallel is the problem here. Could you elaborate on what you mean there?

Screenshot from 2021-12-07 08-22-49
Screenshot from 2021-12-07 08-22-491324×454 19.8 KB

Doing this would be one way of doing what you want.
I hope you can understand what I am meaning.

The inject node is there to simulate a message arriving and to get things going.

the first function node does the first bit you mentioned and the first debug node goes to the code to do the

var num = "+45xxxxxxxx";
var at_cmd = "AT+CMGS=\""+num+"\""; 
msg.payload=at_cmd+"\r";
return msg;

The next function node will send the second part.

Then the last one does the third command you are wanting to do.

3

image
image1867×818 136 KB

This is my flow now - and in short.
Inject - reads the temperature on the 2 sensors every 5 sec. and if the state is belowe 24 C on Temp1 sensor - 2 different phones gets the sms "Temp1 Low" and thats okay now, when i got the delay in. But If both Temp1 and Temp2 changes state at the same time, or when I deploy - the state is set at the same time, then the AT commands is mixed up from the 2 flow.

4

First part of the flow

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]```
5

Second part of the flow

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6

Ok, when first deployed there is a conflict.

Why not add a delay for reading Temp2 so it happens at a different time than Temp1?

I'm not sure how you posted the flow/s but .....

AFAIK, you should be able to post the entire flow in one block - if what your screen shot shows is the whole thing.

But - please - before you post it replace the nodes that get the temperature and replace them with simply a function node that sends a number value with a nominal value.
Otherwise it won't work on my machine. (My: anyone who loads it wanting to help)

7

If you have a section of flow that must only have one message flowing through it at any one time then one way to solve that is to use node-red-contrib-semaphore. I have used that and it works well.

8

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