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diff --git a/slides/what-is-iot.md b/slides/what-is-iot.md index db78358..b0f3762 100644 --- a/slides/what-is-iot.md +++ b/slides/what-is-iot.md @@ -15,6 +15,144 @@ header-includes: --- +# NodeMCU + +!comment(aka NodeMCU aka ESP-12) + +## NodeMCU hardware + +!ifndef(QUICK)( + +) + +## NodeMCU hardware + +!ifndef(QUICK)( +\begin{center} +!include(images/nodemcu.pgf) +\end{center} +) + +## ESP8266 software layers + +!ifndef(QUICK)( +\begin{center} +!include(images/esp+arduino-sdks.pgf) +\end{center} +) + +## ESP8266 + Arduino + +* Standard Arduino IDE +* ESP8266 Arduino core + * https://github.com/esp8266/Arduino + +## Arduino IDE + +!ifndef(QUICK)( + +) + +## Arduino code structure + +~~~ .c++ +void setup() { + // Called once +} + +void loop() { + // Called repeatedly +} +~~~ + +::: notes + +MCU programming is often structured into: + +* Configure + * CPU + * GPIO ports + * MCU's peripherals + * The rest of the board + * Configure application and callbacks. +* Sleep + +Arduino chooses to run the cpu at 100% instead of the sleep step.. + +::: + +## Arduino file structure + + foo/ + foo.ino + config.h + +::: notes + +`foo.ino` must always be in a `foo` directory. + +config.h is created by "new tab". + +::: + +## Generic Arduino APIs + +~~~c++ +// Pin: D0, D1, etc. +// Mode: OUTPUT, INPUT, INPUT_PULLUP +void pinMode(uint8_t pin, uint8_t mode); + +// State: HIGH, LOW, true/false, 1/0 +void digitalWrite(uint8_t pin, uint8_t state); +int digitalRead(uint8_t pin); + +unsigned long now millis(); +unsigned long now micros(); +~~~ + +## ESP Arduino APIs + +~~~c++ +class { + void restart(); + uint32_t getFreeHeap(); + uint32_t getChipId(); + + ... +} ESP; + +// Usage +ESP.restart(); +~~~ + +## ESP Arduino APIs + +~~~c++ +class { + String macAddress(); + + wl_status_t status(); + int32_t RSSI(); + + IPAddress localIP(); + IPAddress subnetMask(); + IPAddress gatewayIP(); + IPAddress dnsIP(uint8_t dns_no = 0); + + ... +} WiFi; + +// Usage: + +Serial.println(WiFi.localIP().toString()); +~~~ + +::: notes + +http://arduino-esp8266.readthedocs.io/en/latest/libraries.html + +::: + # What is IoT ## What is IoT @@ -179,31 +317,28 @@ Datasheet page 18 ## What is the internet again? -## OSI model - -1. Physical Layer -1. Data Link Layer -1. Network Layer -1. Transport Layer -1. Session Layer -1. Presentation Layer -1. Application Layer +## TCP/IP Layers +!ifndef(QUICK)( +\begin{center} +!include(images/tcpip.pgf) +\end{center} +) -* [Wikipedia: OSI model](https://en.wikipedia.org/wiki/OSI_model) -* [Wikipedia: OSI model#Examples](https://en.wikipedia.org/wiki/OSI_model#Examples) - -::: notes - -Does not match the TCP/IP stack very closely. +## Packet encapsulation -::: +!ifndef(QUICK)( +\begin{center} +!include(images/ip-encapsulation.pgf) +\end{center} +) -## Layer 1: Physical Layer +## Network interface -* 10BASE5, 10BASE2 -* 10BASE-T / 100BASE-TX / 1000BASE-TX -* 802.11a/b/g/n PHY +* Ethernet + * 10BASE5, 10BASE2, 10BASE-T / 100BASE-TX / 1000BASE-TX +* Wi-Fi + * 802.11a/b/g/n * RS-232 ::: notes @@ -222,39 +357,17 @@ levels. The signaling does not specify any max data rate, very high rates ::: - -## Layer 2: Data Link Layer - -* Ethernet -* WiFi -* Bluetooth -* Token Ring - -## Layer 3: Network Layer +## Internet * IP * ICMP -* IPX -## Layer 4: Transport Layer +## Transport * TCP * UDP - -## Layer 5: Session Layer - -* "sockets" -* NetBIOS - -## Layer 6: Presentation Layer - -* SSL - -::: notes - -This layer is not really much used in the IP stack - -::: +* SCTP +* QUIC ## Layer 7: Application Layer @@ -300,144 +413,6 @@ Note that the "total length" field is 16 bits, 2 bytes, it's maximum value is 64 \end{center} ) -# Lecture: ESP8266 - -!comment(aka NodeMCU aka ESP-12) - -## NodeMCU hardware - -!ifndef(QUICK)( - -) - -## NodeMCU hardware - -!ifndef(QUICK)( -\begin{center} -!include(images/nodemcu.pgf) -\end{center} -) - -## ESP8266 software layers - -!ifndef(QUICK)( -\begin{center} -!include(images/esp+arduino-sdks.pgf) -\end{center} -) - -## ESP8266 + Arduino - -* Standard Arduino IDE -* ESP8266 Arduino core - * https://github.com/esp8266/Arduino - -## Arduino IDE - -!ifndef(QUICK)( - -) - -## Arduino code structure - -~~~ .c++ -void setup() { - // Called once -} - -void loop() { - // Called repeatedly -} -~~~ - -::: notes - -MCU programming is often structured into: - -* Configure - * CPU - * GPIO ports - * MCU's peripherals - * The rest of the board - * Configure application and callbacks. -* Sleep - -Arduino chooses to run the cpu at 100% instead of the sleep step.. - -::: - -## Arduino file structure - - foo/ - foo.ino - config.h - -::: notes - -`foo.ino` must always be in a `foo` directory. - -config.h is created by "new tab". - -::: - -## Generic Arduino APIs - -~~~c++ -// Pin: D0, D1, etc. -// Mode: OUTPUT, INPUT, INPUT_PULLUP -void pinMode(uint8_t pin, uint8_t mode); - -// State: HIGH, LOW, true/false, 1/0 -void digitalWrite(uint8_t pin, uint8_t state); -int digitalRead(uint8_t pin); - -unsigned long now millis(); -unsigned long now micros(); -~~~ - -## ESP Arduino APIs - -~~~c++ -class { - void restart(); - uint32_t getFreeHeap(); - uint32_t getChipId(); - - ... -} ESP; - -// Usage -ESP.restart(); -~~~ - -## ESP Arduino APIs - -~~~c++ -class { - String macAddress(); - - wl_status_t status(); - int32_t RSSI(); - - IPAddress localIP(); - IPAddress subnetMask(); - IPAddress gatewayIP(); - IPAddress dnsIP(uint8_t dns_no = 0); - - ... -} WiFi; - -// Usage: - -Serial.println(WiFi.localIP().toString()); -~~~ - -::: notes - -http://arduino-esp8266.readthedocs.io/en/latest/libraries.html - -::: - # Lecture: MQTT ## MQTT |