Maximo JSON API: An IoT Example
- October 3, 2019
- Alex
- 9 Responses
- October 3, 2019
- Alex
- 9 Responses
I’ve had a lot of conversations recently with folks attempting to implement more Condition Monitoring within their organization. The benefits of shifting from time-based maintenance to condition- or use-based maintenance are well documented and very real. However, making that shift involves a fair amount of planning, analysis, and technology. This article will show an example of how to bridge a small portion of the technology gap; specifically we will focus on creating meter readings in Maximo via the JSON API available in Maximo 7.6.0.2 and higher.
Meter readings are the heart of how Condition Monitoring is implemented in Maximo. They represent a piece of data at a point in time associated with an asset. This data could be related to the asset’s condition such as temperature, pressure, voltage, etc. This data could also be related to the asset’s usage such as an odometer reading, the number of cycles of the asset, etc. Lastly, the data could be based on a simple value list such as Pass/Fail, Open/Closed, Blowing / Not Blowing, etc.
To create a new meter reading via Maximo’s JSON API, let’s start with an example:
POST http://mxapprove.a3jgroup.com/maximo/oslc/os/mxasset/_QkVERk9SRC8xMTQ1MA==?lean=1
maxauth: c21pdGg6c21pdGgx
Content-Type: application/json
properties: *
x-method-override: PATCH
patchtype: MERGE
{
"assetmeter": [
{
"metername": "O-PRESSUR",
"linearassetmeterid": 0,
"newreading": "4900"
}
]
}
Let’s look at this part-by-part. First, we start with the HTTP POST itself.POST /maximo/oslc/os/mxasset/_QkVERk9SRC8xMTQ1MA==?lean=1maxauth: c21pdGg6c21pdGgx
Content-Type: application/json
properties: *
x-method-override: PATCH
patchtype: MERGE{
"assetmeter": [
{
"metername": "O-PRESSUR",
"linearassetmeterid": 0,
"newreading": "4900"
}
]
}
Note that we don’t need any identifying information about the asset in the message body, such as the ASSETNUM or SITEID. This is because we are required to specify the unique identifier in the URL string. We specify the assetmeter key as an array of meters associated with the asset. For this example, we are only updating a single meter against the asset (Outlet Pressure). In our object, we specify the Meter Name and New Reading value. The linearassetmeterid key with a value of 0 is necessary due to that field being part of the unique identifier on the ASSETMETER table. Values such as the New Reading Date and Inspector will default based on the current date and the logged in user credentials, but can also be specified explicitly in the message.
Please feel free to leave questions or comments below. Good luck in your IoT journey! Share This
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9 Comments
hi
when i send maximo update through rest api using
external system,publish channel and end point,
the json in update be like (contain rowstamp)
{
“_id”: “R18867-RAM”,
“_rowstamp”: “767476799”,
“description”: “az”,
“href”: “https:\/\/flsmidth.maximo.com\/maximo\/oslc\/os\/createpr\/_UjE4ODY3L1JBTQ–“,
“orgid”: “ACC”,
“pr1”: “QC”,
“prnum”: “R18867”,
“siteid”: “RAM”,
“status”: “NEW”,
“status_description”: “New PR”
}
i need not to add rowstamp, i found proerty called _Urs, but i don’t know how to use till now,
please help if you know
For outbound publish channel messages, you should be able to use Maximo’s JSON Mapping application to transform the JSON payload to a format that your external system understands.
im tryng to post this with postman
maxrest/oslc/os/mxwomobile/46693?lean=1
{ assetmeter:
[ { metername: ‘KEBOCORANMINYAK’,
assetnum: ‘877618’,
siteid: ‘TND’,
newreadingdate: ‘2020-08-13T08:43:34’,
newreading: ‘Bersih’,
inspector: ‘INSPEKSI.LUWUK’,
linearassetmeterid: 0 },
{ metername: ‘KONDISIFISIK’,
assetnum: ‘877618’,
siteid: ‘TND’,
newreadingdate: ‘2020-08-13T08:46:30’,
newreading: ‘Cacat Sirip Major’,
inspector: ‘INSPEKSI.LUWUK’,
linearassetmeterid: 0 }]}
but i get return 400 like this
{
“Error”: {
“reasonCode”: null,
“message”: “oslc#create_on_updateuri”,
“statusCode”: “400”
}
}
please help me
The issue is the last element in your URL. It needs to be the REST ID of the Asset record you’re trying to update.
In the article’s example, the /_QkVERk9SRC8xMTQ1MA== represents a unique identifier for an Asset record that can be referenced in the MXASSET Object Structure. This identifier can be found be querying for the asset using an HTTP GET to the same MXASSET Object Structure, or it can be derived by base64 encoding the asset’s ASSETNUM + “/” + SITEID and prefixing that string with an underscore (“_”) character.
Hello, thank you very much for this!
Using what you say I’m trying to do a POST to os/mxincident however I’m having troubles just to get a response status = 200.
I executed this two requests:
POST: https://host_url//maximo/oslc/os/mxincident/ticketuid I get 400 with the message “oslc#create_on_updateuri”
POST: https://host_url//maximo/oslc/os/mxincident/ticketid I get 500 with the message “For input string: \”IN41321576\””
I don’t know what else to try… Do you have an advice to give me, please?
The issue is the last element in your URL. It needs to be the REST ID of the Incident record you’re trying to update.
In the article’s example, the /_QkVERk9SRC8xMTQ1MA== represents a unique identifier for an Asset record that can be referenced in the MXASSET Object Structure. This identifier can be found be querying for the asset using an HTTP GET to the same MXASSET Object Structure, or it can be derived by base64 encoding the asset’s ASSETNUM + “/” + SITEID and prefixing that string with an underscore (“_”) character.
Thanks for this, was playing with python and noticed params needed the ‘spi’ in front? Seems to work now, with API key this way, was unsure if there was a difference. Great trick with the unique identifier!
——-
import config
import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning
meterread=’100.00′ #your new reading, can put in params to json too
apikey= ‘apikeyxxxxxxxxxx’
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
host = ‘https:/host_url/maximo’ #dev
url=’/maximo/oslc/os/mxasset’
url = host + url #renamed for DEV.Testing
headers = {
‘apikey’: apikey,
‘properties’: ‘*’,
‘Content-Type’: “application/json”,
‘x-method-override’: ‘PATCH’,
‘patchtype’: ‘MERGE’
}
params = {
‘oslc.select’: ‘assetuid’,
‘oslc.where’: ‘assetnum=12345’ #return the unique identifier from asset num
}
r=requests.get(url, headers=headers, params=params,verify=False)
x=r.json()
uniqueid= (x[‘rdfs:member’][0][‘rdf:about’]) #get the unique identifier in the URL string
url=uniqueid #unique identifier in the URL string.
params = {
“spi:assetmeter”: [
{
‘spi:inspector’ : ‘JOEY’,
‘spi:newreadingdate’ :’&SYSDATE&’,
“spi:metername”: “FLOAT”,
“spi:linearassetmeterid”: 0,
“spi:newreading”: meterread #from ‘meterread=’100.00′ #your new reading’
}
]
}
r=requests.post(url, headers=headers, json=params,verify=False)
pprint(r.status_code)
Nice! You can use the lean=1 query parameter to avoid having to include the namespace prefixes.
In your HTTP GET you can include ‘lean’: ‘1’ in your params object. That should allow you to drop the rdfs: and rdf: prefixes from the initial response. Then you can append a ‘?lean=1’ to the HTTP POST and drop the spi: prefixes from the body of the request.
Using POSTMAN, I am able to post the data and receive 200. But, the meter readings are not updating as expected. I am bale to update the same meter readings with MXMETERDATA. Any suggestions?
Thanks-