mangOH project: how to create it?

1

Hi all!
I think I’m posting a stupid question, but I can’t find a guide about it.
I have a mangOH green with a wp7607 module and a Talon CAN bus transceiver .
My project consists in acquiring CAN signals and eventually storing them on SD and sending them on the cloud , implementing an MQTT communication .
I installed the driver CAN and I finally can see the CAN signal detected in the ifconfig menu. I also installed a SIM and I also managed to connect my mangOH device to AirVantage.
I followed this guide to understand how works a Legato project and I also worked on the mentioned tutorials (that worked well):

I’m compiling the mangOH project from gitHub:

My question is: which are the files I need to work on in this project? I’ll explain. Following the example of hello_world, the COMPONENT INIT is found in the .c file. In my case, to work on the CAN network on which file should I work? On can_iot.c? Would he be my main? Or green.sdef?

Yet another question. If I wanted to implement MQTT communication, using for example MOSQUITTO MQTT, which file should I work on? In my project I see a mqttClientComp folder: do I have to work in mqttmain.c? And should the make be done in this folder? What and how do I send the file to the board? Is it enough to send all the .update file that I compile by doing the make in the main folder?

Really sorry for the inconvenience, I would like to clarify my ideas on these aspects, if by chance there is a guide well done about it, if you could link it to me, I would be very happy.
Greetings

2

for mqtt , you can see here:

3

Useful example. But my question is the following. In the mangOH project folder I have many other folders, for example in apps I see the mqttClient folder. I ran make wp76xx in this folder and it obviously generated an .update file. At this point what should I do? Load on the card the various .updates generated in all the folders, or just send me the general .update of the whole mango folder?

4

for mangoh projevct, you are not building with “make wp76”.
Should be something like “make green_wp76xx”.
Probably you need to see the Makefile.

5

image
image739×230 46.4 KB

…

image
image720×199 46.7 KB

isn’t it correct?

6

then this is just compiling the mqttclient application as inside the Makefile, it is calling mkapp:

7

okay, but I have to use the command makeapp with .adef files right?
mkapp program.adef -t wp76xx

8

yes, that is correct.

1 Like
9

Thanks. So, in order to understand how to work in the next weeks, I wil try to summarize what I understand.

  1. If I want to manage CAN communication:

  • I follow this path: /home/mangoh/Downloads/mangOH_2-7-2019_mangoh_green_CAN_OK/mangOH_2-7-2019/linux_kernel_modules
    In this path I find:
    image
    and I have to act on the can_iot.c or equivalently on the script start_can.sh. I don’t have to do other things because I have already done:
    image

  • So I have only to refresh the .update file doing make green_wp76xx in mangOH folder.
    Have I to use kill switch app? I read something about it…

  1. If I want to manage MQTT communication
  • I follow the path /home/mangoh/Downloads/mangOH_2-7-2019_mangoh_green_CAN_OK/mangOH_2-7-2019/apps
  • cd MqttClient
  • any changes in .c files
  • mkapp -t wp76xx mqttClient.adef
  • app install mqttClient wp76xx.uodate 192.168.2.2
  • I enter in the board and see if Mqtt app is started or not
  • Alternatively: in MqttClient folder there is a script folder that contains the bt-init.sh file: I could work on it and flash it on the board.

Do you agree with my reasoning? I apologize for the inconvenience, but I am trying to fix my ideas and what I know, in view of what I have to do in the next few days.
Greetings

10

Is not right my reasoning?