esib_iot_challenge
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
esib_iot_challenge [2017/05/17 10:25] – samer | esib_iot_challenge [2017/05/18 09:52] – [5.3. The Radio Challenge] samer | ||
---|---|---|---|
Line 1: | Line 1: | ||
====== ESIB IoT Challenge ====== | ====== ESIB IoT Challenge ====== | ||
- | Welcome to the ESIB IoT Challenge. In this challenge, you will designing and prototyping the first IoT services based on a LoRaWAN network. | + | Welcome to the ESIB IoT Challenge. In this challenge, you will be designing and prototyping the first IoT services based on a LoRaWAN network. |
- | ===== -. What is a LoRaWAN | + | ===== -. Platform ===== |
- | In this challenge, you will benefit from the first experimental platform implementing an end-to-end LoRaWAN solution in Lebanon. The platform consists of the following elements: | + | During |
* Devices that communicate to one or more gateways via a wireless interface using single hop LoRa and implementing the LoRaWAN protocol. These devices are physically connected to sensors that generate data. | * Devices that communicate to one or more gateways via a wireless interface using single hop LoRa and implementing the LoRaWAN protocol. These devices are physically connected to sensors that generate data. | ||
Line 14: | Line 14: | ||
[{{ : | [{{ : | ||
+ | <WRAP center round help 100%> | ||
+ | * Where is the LoRa modulation implemented on the platform? | ||
+ | * What are the advantages of the LoRa modulation? | ||
+ | * How LoRa is compatible with LPWAN requirements and constraints? | ||
+ | * What is LoRaWAN? What is the difference between LoRaWAN and LoRa? | ||
+ | * Illustrate the protocol stacks on the LoRaWAN platform. | ||
+ | * What elements are IP enabled in the platform? What do you think about IP support in IoT? | ||
+ | </ | ||
+ | ===== -. Backend ===== | ||
+ | In a LoRaWAN network, the devices communicate with a Network Server through the gateway. The backend installed in the platform is based on an open-source LoRaWAN network-server https:// | ||
+ | |||
+ | [{{ : | ||
+ | |||
+ | Start by choosing the application named '' | ||
+ | * A unique node name: '' | ||
+ | * The node description | ||
+ | * A unique device EUI on 64 bits: Random identifiers can be generated on [[https:// | ||
+ | * The application EUI on 64 bits: '' | ||
+ | * A unique application key on 128 bits also obtained by random generation. | ||
+ | |||
+ | Make sure that the '' | ||
+ | |||
+ | <WRAP left round help 100%> | ||
+ | * What does the application EUI mean? How is it used in LoRaWAN? | ||
+ | * What does the application key mean? How is it used in LoRaWAN security? | ||
+ | * Compare the two device activation methods used in LoRaWAN by giving the advantages and inconvenients. | ||
+ | * What is the difference between the two receive windows in LoRaWAN? What are they used for? | ||
+ | </ | ||
===== -. Devices ===== | ===== -. Devices ===== | ||
- | ==== -. PC Configuration ==== | + | Devices in the LoRaWAN |
- | In orde to program | + | |
- | * Arduino IDE | + | Start by verifying the installation on your PC of the latest |
- | * LMIC Library | + | |
- | ==== -. Arduino | + | <WRAP left round help 100%> |
+ | * Give the characteristics of the Arduino | ||
+ | * Give the main characteristics of the LoRa shield from Dragino | ||
+ | * What type of Antenna are you using? Explain the corresponding characteristics. | ||
+ | </ | ||
- | Devices in the LoRaWAN platform are implemented on Arduino boards with Dragino shields. The combined module | + | Now you should configure your device with the same identifiers '' |
- | The pin mapping corresponds to the Dragino electronic schematic: | ||
<code c++> | <code c++> | ||
- | const lmic_pinmap lmic_pins | + | static |
- | .nss = 10, | + | void os_getArtEui (u1_t* buf) { memcpy_P(buf, APPEUI, 8);} |
- | .rxtx = LMIC_UNUSED_PIN, | + | |
- | .rst = 9, | + | |
- | .dio = {2, 6, 7}, | + | |
- | }; | + | |
- | </ | + | |
- | The send function is rescheduled TX_INTERVAL seconds after each transmission complete event: | + | // This should also be in little endian format, see above. |
- | <code c++> | + | static const u1_t PROGMEM DEVEUI[8]= { }; |
- | case EV_TXCOMPLETE: | + | void os_getDevEui |
- | Serial.println(F(" | + | |
- | if(LMIC.dataLen) { | + | |
- | | + | |
- | Serial.print(F(" | + | |
- | Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen); | + | |
- | | + | |
- | } | + | |
- | // Schedule next transmission | + | |
- | os_setTimedCallback(& | + | |
- | break; | + | |
- | </ | + | |
- | The send function is initially scheduled here: | + | static const u1_t PROGMEM APPKEY[16] = { }; |
- | <code c++> | + | void os_getDevKey (u1_t* buf) { memcpy_P(buf, APPKEY, 16);} |
- | do_send(& | + | |
</ | </ | ||
- | The message containing the sensor values is transmitted on one of the radio channels: | + | <WRAP left round tip 100%> |
- | <code c++> | + | Note that the device and application identifiers should be in little endian format, while the application key is in big endian format. For example, '' |
- | LMIC_setTxData2(1, | + | </WRAP> |
- | </code> | + | |
- | === -. Triggered Message Sending === | + | Let us analyze to radio parameters in the sketch by answering the following questions. |
- | You can also find another example of sketch to download: {{ : | + | <WRAP left round help 100%> |
+ | * In the setup function, which channels are activated on the device? | ||
+ | * What are the different spreading factors on each channel? | ||
+ | * What is the regulation | ||
+ | </ | ||
- | ===== -. Backend ===== | + | The LMIC library defines a set of events corresponding to the protocol machine state. These events appear in the '' |
- | ==== -. Loraserver ==== | + | |
- | The Loraserver has a web interface for configuring | + | <WRAP left round help 100%> |
+ | * What is the difference between the JOINING | ||
+ | * When is the EV_TXCOMPLETE event called? | ||
+ | </WRAP> | ||
- | [{{ : | + | Finally let us look at the message sending on the device. |
- | Start by creating and application as in Figure 5. Then create a node in this application and provide the following information: | + | <WRAP left round help 100%> |
- | * A unique node name | + | * What is the function for sending messages on the device? How it is called? |
- | * The node description | + | * What is the period of message sending? Explain the implementation choice. |
- | * A unique device EUI on 64 bits: Random identifiers can be generated on [[https:// | + | * Is this period guaranteed according to the LoRaWAN specification? |
- | * The application EUI on 64 bits: this can be a common identifier for all nodes using the same application. | + | </ |
- | * A unique application key on 128 bits | + | |
- | In order to enable OTAA join method, | + | Now you are ready to compile |
+ | <WRAP left round tip 100%> | ||
+ | For Arduino Mega 2560, additional drivers can be installed on Windows from http:// | ||
+ | </ | ||
- | ==== -. The Things Network ==== | + | Open the serial monitor in the Arduino IDE at 115200 baud and analyse the debug messages. |
- | ===== -. Applications ===== | + | <WRAP left round help 100%> |
- | ==== -. mqtt-spy ==== | + | * What is the radio transmit parameters of the captured debug messages? |
+ | * What is the radio receive parameters of the captured debug messages for the two receive windows? | ||
+ | </ | ||
+ | Getting back to the backend, you can monitor some important information related to your device. Click on the corresponding node session. | ||
+ | |||
+ | <WRAP left round help 100%> | ||
+ | * What are the different fields that appear in the node session corresponding to you device? | ||
+ | * Explain how each field is created according to the LoRaWAN specification. | ||
+ | * What are the different counters visible at the backend? Explain how they get incremented and how they are used. | ||
+ | </ | ||
+ | ===== -. Applications ===== | ||
mqtt-spy is an open source utility intended to help you with monitoring activity on MQTT topics. It has been designed to deal with high volumes of messages, as well as occasional publications. mqtt-spy is a JavaFX application, | mqtt-spy is an open source utility intended to help you with monitoring activity on MQTT topics. It has been designed to deal with high volumes of messages, as well as occasional publications. mqtt-spy is a JavaFX application, | ||
- | You can use mqtt-spy to debug the messages received from the LoRaWAN devices. | + | You can use mqtt-spy to debug the messages received from the LoRaWAN devices. |
- | ==== -. Emoncms | + | |
+ | <WRAP left round help 100%> | ||
+ | * Summarize the concepts and functionalities of the MQTT protocol. | ||
+ | * What are the possible strengths and weaknesses in terms of security of MQTT? | ||
+ | * What are the different types of topics used by the backend? Explain. | ||
+ | * Explain the different fields in a captured MQTT message received from you device. | ||
+ | </ | ||
+ | |||
+ | <WRAP left round tip 100%> | ||
+ | The payload received by the MQTT client is decrypted but encoded in Base64. You should decode it to get the original message. | ||
+ | </ | ||
+ | |||
+ | If you need to send data to your device, you should publish the encoded message in the corresponding topic '' | ||
+ | |||
+ | < | ||
+ | { | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | } | ||
+ | </ | ||
+ | ===== -. The Challenges | ||
+ | |||
+ | ==== -. The End-to-End Challenge ==== | ||
+ | I can send data from the device to the application. | ||
+ | |||
+ | ==== -. The Downlink Challenge ==== | ||
+ | I can send data from the application to the device. | ||
+ | |||
+ | ==== -. The Radio Challenge ==== | ||
+ | I can tune the LoRa radio parameters and assess the results. | ||
+ | |||
+ | These two commands can be helpful: | ||
+ | |||
+ | <code c++> | ||
+ | LMIC_disableChannel(N); | ||
+ | LMIC_setDrTxpow(DR_SF12, | ||
+ | </ | ||
+ | ==== -. The Sensor Challenge ==== | ||
+ | I can use different sensors to send data from the device. |
esib_iot_challenge.txt · Last modified: 2021/08/28 09:53 by samer