Read water consumption data from my Thames Water meter, so that I can feed it into Home Assistant, my smart home system of choice, for consumption monitoring.
This is most desirable; it's already smart.
However, this is not possible, it's encrypted and the keys aren't publicly available.
There is an open data portal here: https://data.thameswater.co.uk/ but it's nothing to do with domestic water consumption, so is not relevant to this effort.
Three-day old hourly data is available via the website (login -> my water use).
Consumption data is picked up for display by the UI from the following endpoint:
https://myaccount.thameswater.co.uk/ajax/waterMeter/getSmartWaterMeterConsumptions
A minimal working request to this is as follows:
curl "https://myaccount.thameswater.co.uk/ajax/waterMeter/getSmartWaterMeterConsumptions?meter=METER_ID_HERE&startDate=05&startMonth=07&startYear=2024&endDate=05&endMonth=07&endYear=2024&granularity=H&premiseId=&isForC4C=false" \
-H "cookie: b2cAuthenticated=true; JSESSIONID=xxx; OAUTH=xxx; LoggedIntoMyAccount=1" \
-H "referer: https://myaccount.thameswater.co.uk/mydashboard/my-meters-usage" \
-H "x-requested-with: XMLHttpRequest"
More cookies than that are set, but only those four are required. The referer and x-requested-with headers are also required.
Obtaining the values for JSESSIONID and OAUTH is non-trivial- the flow between the login screen and the server returning
either of those cookies is quite indirect and messy.
I have made a small start; the login form POSTs to https://login.thameswater.co.uk/identity.thameswater.co.uk/B2C_1_tw_website_signin/SelfAsserted?tx=StateProperties=SOMEVALUE&p=B2C_1_tw_website_signin
with data request_type=RESPONSE&email=YOUR_ACCOUNT_EMAIL&password=YOUR_PASSWORD, and the server does a 302 redirect into the flow which
results in those cookies being set.
Install a secondary water meter which I own and control.
This situation stinks.
Thames Water, if you are reading this, please give consumers some way to read their own smart water meter consumption data preferably by adding a documented way of getting domestic water consumption data to your open data portal (https://data.thameswater.co.uk). We shouldn't have to jump through these hoops in this day and age.
A thread here: https://community.home-assistant.io/t/thames-water-data/497603; nothing conclusive
Looks like someone did a Selenium-based scraper: https://github.com/papadeltasierra/thameswater - it clicks buttons and outputs to a CSV file - not quite what we're after but might be a useful start
This scraper is not relevant since it's just about the discharges API: https://github.com/mossc001/Thames_Water_API_to_Home_Assistant