Temperature, HTTP-Request

[BernhardSchlegel]

Hi everyone,

I want to implement (stuff that I think I figured out is denoted by () ) for my Sonoff TH16

• Acquiring the temperature from the DS18B20
• Posting a JSON to a REST-Endpoint
• (Calling it every 10s: TimeReached(state_10second) in tasmota.h)
• (implementing a custom setting menue)

I'm very thankfull for any input (sample code, reference to a file from the repo, buzzword that might show the direction) concerning:

1. How to get the temperature? (I tried getting the temperature using mqtt_data, ds18x20_sensor but that's not accessible)
2. How to create a JSON object out of it? (Can I use e.g. ResponseAppend_P)
3. What's the slimmest way of including something for http.get(target_url, payload)?

I used to be not too bad with C, but I'm a little overwhelmed by the amount of helper function based string concatenations and function pointer callbacks.

Thanks in advance!

[ascillato]

Hi, you don't need to program or modify Tasmota for that. It is already supported. And there are plenty of examples in the docs and in old issues. Please do a search.

You can use the Tasmota feature called RULES and the command WEBSEND.

Please, read the docs. Thanks.

[barbudor]

You can implement this using Rules, Websend and setting teleperiod to 10 seconds

Something like
on tele-DS18B20#Temperature do Websend [serverip] /rest/api/endpoint?%value%
should do it

[BernhardSchlegel]

Is it possible to get the returned value from Websend? Say my REST enpoint returns a simple 1 / 0 (not even JSON for that matter). As I understood it that's not possible? I would need something like "Webget" - would that be a PR that is likely to be accepted?

[barbudor]

Not by default when using rules
If you use Scripting-Language instead, it is possible to get the response from a WebSend.
To use Scripting, you need either to recompile (see top of the doc page) or go to github.com/tasmota/binaries for a "unsupported" pre-compiled version of tasmota with scripting

[BernhardSchlegel]

Can I get you guys a beer? https://paypal.me/tasmota ?