From a4cbbee0671ff20560c31a2f3945b6131496ab2b Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Wed, 13 Jun 2018 20:41:24 +0200
Subject: wip

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 assignments/mqtt/mqtt.pdf | Bin 104784 -> 0 bytes
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-# Assignment: MQTT
-
-## Goal
-
-Get aquainted with MQTT.
-
-## Steps
-
-1. Connect to the Wi-Fi network
-    * Use `WiFi.localIP()`
-
-1. Connect to MQTT broker
-1. Publish temperature
-
-## Tips
-
-To generate a client id make something with `ESP.getChipId()`{.cpp}
-
-Creating a `String` from a number:
-
-* `String(123) => "123"`{.cpp}
-* Hex formatted: `String(0x123abc, HEX) => "123abc"`{.cpp}
-
-Some APIs require "plain C strings" aka a `char *`{.cpp}. They can be converted with `String::c_str()`:
-
-~~~.c++
-char *cStr = myString.c_str();
-~~~
-
-## Bonus
-
-**1:** Print the heap free size at regular intervals.
-
-**2:** Implement min, max and average temperature over configured interval.
-
-Suggested parameters:
-
-* Sample interval: 2 seconds
-* Publish interval: 10 seconds
-
-**3:** Make sure the values are calculated even if we're reconnecting to the Wi-Fi or MQTT server.
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