Set parameter to DESSMonitor via public api

[eborjalopez]

Hello @SilverFire ,

Im able to read the data from my DESSMonitor using the public api gathered as per instructions on the project. Im interested in sending commands through this API so Im able to change parameters and seeing applied to my inverter e.g.:

bt_ |
17 |  
id | "bt_charger_source_priority"
par | "Charger Source Priority"
val | "Solar priority" ----> to "Solar only"

bc_ |
4 |  
id | "bc_output_source_priority"
par | "Output Source Priority"
val | "Utility" ----> to "SBU"

Any idea how to do this?

Found this API documentation but it's in Chinese so difficult to digest https://api.dessmonitor.com

This seems to be the one to use https://api.dessmonitor.com/chapter4/sendCmdToDevice.html but still trying to get the list of 16-string command to send

Thanks and regards,

[SilverFire]

Hello!
Thanks for reaching out.
Unfortunately, my inverter does not support parameters changing over the air.

A potential way to discover the command structure would be to monitor network traffic while changing parameters through the DessMonitor Web UI. Using your browser's Developer Tools (Network tab), you could capture and analyze the API calls made when modifying settings.

If you manage to capture and decode the command structure successfully, please consider sharing your findings – it would be valuable information for other users working with this integration.

[eborjalopez]

Ive managed to get it working via DESSMonitor API. Been monitoring the queries and the post requests sent by the web to my WiFI Plug and found out that what changes are the values for "action" and "id" fields, and a new one is added to the request called "val" which indicates what param is set. Examples (hiding sensitive data from my connection):

https://web.dessmonitor.com/public/?sign=XXXXXXXXXXXXXXXX&salt=XXXXXXXXXXXXXXXX&token=XXXXXXXXXXXXXXXX&action=ctrlDevice&source=1&pn=XXXXXXXXXXXXXXXX&sn=XXXXXXXXXXXXXXXX&devcode=XXXX&devaddr=X&id=los_output_source_priority&val=2&i18n=en_US

When performing GET requests on actual parameters set the action field used is "queryDeviceCtrlValue". In this specific param (Output Source Priority) values are: 0 for "Utility", 1 for "Solar", and 2 for "SBU". For any param change the action value is changed to "ctrlDeviceCtrlValue".

What I did was to set different online cron jobs (cron-job.org) that executes changes through the DESSMonitor API on the set time, and it worked like a charm so by now no need to install anything extra at home to fulfil my needs.

Next step are:

1. Check if token expires in the upcoming days, in case I would need to find a more complex solution than a simple cron so I first fetch the token somehow and then construct the call to query/post to DESSMonitor (any idea?)
2. Investigate how to connect to the Wifi Plug locally (without DESSMonitor) so I set the changes within my network
3. Optimise the approach so I build a solution with either a HA or with a small code on an Arduino/Raspberry I can set next to my Inverter

Ideas, suggestions, comments welcome :)

[eborjalopez]

update on point 1: new login tested and several values are changed (sign, salt, and token), but original requests used by the crons work. Just checked the execution and seen no errors, and tried manually; both show the value changed on the inverter.

Now will try to find some time to focus on points 2 and 3 :)

[SilverFire]

In #3 (comment), @scoleri shared a link to his repository with a simple Bash script designed to refresh the authentication token.

I plan to integrate this script behavior into the repository later, but you might find it useful for your cron jobs in the meantime.