User manual

The measured results in the chart
The source text seems to differ a lot from all previous programs. However, it is
essentially composed of known elements. A Progmem variable contains the HTTP
request that must be sent to the ThingSpeak-page, as well as some placeholders
that need to be replaced as necessary.
001
POST *URL* HTTP/1.1
002
Host: api.thingspeak.com
003
Connection: close
004
Content-Type: application/x-www-form-urlencoded
005
Content-Length: *LEN*
006
007
*APPEND*
As you can see, the call is nearly identical to the known Get call. Again, you need
to enter an *URL*. You also need to replace *LEN* with the length of the message
that you will then enter instead of *APPEND*.
This is the universally valid format for the website with which data are sent to the
page with the POST-request. If you now want to enter measured data into a chan-
nel in your account as show in this example, you need to use the following struc-
ture: *URL* is