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reel sensor discovery on the beagleboard/raspberry pi [message #1749207]

Sat, 03 December 2016 00:09

Eclipse User

Hi,
I have install the gateway on my raspberry pi, and on this raspberry pi, i have many sensor working, i have some python code that display sensor values, but i'm not able to retreive they data to my OM2M gateway, please can you show step by step a quick sample. on how to establish communication betwwen the sensor and my gateway, or recommand me a good framework to do that ?

Thks in advance
@Cyril

Re: reel sensor discovery on the beagleboard/raspberry pi [message #1749788 is a reply to message #1749207]

Mon, 12 December 2016 05:13

Eclipse User

Hi Cyril,

I think there are different ways to make this communication between the gateway and your existing python client.
One way is to integrate an HTTP / CoAP client in your python app to push the data through the REST API of OM2M (usin oneM2M standard). This way can ensure you the portability of your client and you could change easily where you want to store your data (gateway or server for instance).
You can get inspiration from these tutos to understand how to push data through the REST API:
REST API
Develop oneM2M app

Another way would be to add a new plugin to OM2M and interact directly in Java with the platform but you would have to make the communication between the Java (OSGi bundle) process and your python app.

Hope this helps,
Guillaume

Re: reel sensor discovery on the beagleboard/raspberry pi [message #1750071 is a reply to message #1749788]

Thu, 15 December 2016 12:35

Eclipse User

Thank you Guillaume,
i've been able to create a TEMPERATURE sensor APP on my server (not possible on the gateway) and the main problem is that, when i try to update the sensor value using a POST request, it's not working, i think i'm not wel retargeting the good container or the sensor has been not well created,
Find attached my screen capture of the temperature sensor,
then i use POSTMAN to try to update/retrive the sensor value , (not working)
When i copy the same datacreation code, it jus create another container instance and store the value inside it, but me i jus want to be able the update the sensor value, and also get it directly, using the GetValue buton.

So please, if you could send me a tutorial on how to POST data to update a sensor value
and how to retrieve a sensor value also, using GET request, with clear URL, Clear Body,

Please,

Attachment: OM2M Temperature_sensor.jpg
(Size: 26.62KB, Downloaded 264 times)
Attachment: OM2M CSE_Getting_Value_failled.jpg
(Size: 90.81KB, Downloaded 251 times)
Attachment: Posting_new_value_not_working.jpg
(Size: 84.23KB, Downloaded 227 times)

Re: reel sensor discovery on the beagleboard/raspberry pi [message #1750072 is a reply to message #1750071]

Thu, 15 December 2016 12:39

Eclipse User

In addition,
i will like to say that i have already set up my Python code, on the Raspberry Pi, that will send the sensor value using POST or CoAP client,
i jus need this last part to finish the full test of OM2M framework and do a tutorial on it.

Thank's in advance.

Attachment: Raspberry_sendind_data.jpg
(Size: 90.05KB, Downloaded 297 times)

Re: reel sensor discovery on the beagleboard/raspberry pi [message #1750143 is a reply to message #1749788]

Fri, 16 December 2016 06:07

Eclipse User

Hello,
i've been able to find and understant how to post data, but façing some issue when trying to update / container instance of my sensor applacation,
when i POST the XML data, i get this message : " 409 Conflict Name already present in the parent collection. " ,

Here is my XML content :

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<m2m:cin xmlns:m2m="http://www.onem2m.org/xml/protocols" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.onem2m.org/xml/protocols CDT-cin-v1_0_0.xsd" rn="cin">
<cnf>text/plain:0</cnf>
<con>24.437</con>
</m2m:cin>

If some one can give me the good xml query content to update a container instance

Attachment: Update_container_instance_failled.jpg
(Size: 73.48KB, Downloaded 201 times)

Re: reel sensor discovery on the beagleboard/raspberry pi [message #1750243 is a reply to message #1750143]

Mon, 19 December 2016 04:29

Eclipse User

Hi Cyril,
BE careful when you post your new instance of data you specify a resource name (rn) in the payload. However this name should be unique regarding to all the content instances in the same container. This is why you get this error because you try to create multiple content instances with the same name. You can just not specify any name and the platform will generate a unique one.
Link to this topic also regarding the update of content instance: https://www.eclipse.org/forums/index.php/t/1083202/

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