My NodeMCU are sending data using MQTT to the broker. Then this flow get the topic and the data and save on InfluxDB using its HTTP API.

Screenshot_11

http://flows.nodered.org/flow/5c96cc92d3171b6434bf

In function we have this code:
 

var tokens = msg.topic.split("/");
var dest = tokens[tokens.length-1];
msg.url ="http://localhost:8086/write?db=greenhouse";
msg.payload = tokens[2] + ",device=" + tokens[1] + " value=" + msg.payload;
return msg;

Here is a graphics sample:

Screenshot_12

Seems that the Texas SNB9024 is the man when we need an RTC. I will try to reach it using the Quark.
Ref.:
3.5 Power management IC (PMIC)
http://www.intel.com/content/dam/support/us/en/documents/edison/sb/edisonmodule_hg_331189004.pdf

4.13 V_VBAT_BKUP have some instructions about the register to configure the VBAT charging.

Datasheet: http://www.ti.com/product/TPS65910/datasheet

Today (23/02/16) I'm giving up from using Intel Edison's MCU for the prototype. I will start using Arduino to make the sensors work. When it get ready, I will see if Intel will have publicated more documentation ou if I need to abandon the internal MCU.

I posted a question on Edison's Forums but until now, nothing helped me. https://communities.intel.com/thread/99031