esib_iot_challenge
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esib_iot_challenge [2017/05/17 17:53] – [3. Devices] samer | esib_iot_challenge [2017/05/23 18:48] – [6.2. Nausicaa Challenge] samer | ||
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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:// | 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 '' | Start by choosing the application named '' | ||
Line 72: | Line 72: | ||
</ | </ | ||
+ | Let us analyze to radio parameters in the sketch by answering the following questions. | ||
- | The pin mapping corresponds to the Dragino electronic schematic: | + | <WRAP left round help 100%> |
- | <code c++> | + | * In the setup function, which channels are activated on the device? |
- | const lmic_pinmap lmic_pins = { | + | * What are the different spreading factors on each channel? |
- | .nss = 10, | + | * What is the regulation on the radio channels in LoRa? |
- | .rxtx = LMIC_UNUSED_PIN, | + | </WRAP> |
- | .rst = 9, | + | |
- | .dio = {2, 6, 7}, | + | |
- | }; | + | |
- | </code> | + | |
- | The send function is rescheduled TX_INTERVAL seconds after each transmission complete event: | + | The LMIC library defines a set of events corresponding to the protocol machine state. These events appear |
- | <code c++> | + | |
- | case EV_TXCOMPLETE: | + | |
- | Serial.println(F(" | + | |
- | if(LMIC.dataLen) { | + | |
- | // data received | + | |
- | Serial.print(F(" | + | |
- | Serial.write(LMIC.frame+LMIC.dataBeg, | + | |
- | Serial.println(); | + | |
- | } | + | |
- | // Schedule next transmission | + | |
- | os_setTimedCallback(& | + | |
- | break; | + | |
- | </ | + | |
- | The send function is initially scheduled here: | + | <WRAP left round help 100%> |
- | < | + | * What is the difference between the JOINING and the JOINED events? |
- | do_send(& | + | * When is the EV_TXCOMPLETE event called? |
+ | </ | ||
+ | |||
+ | Finally let us look at the message sending on the device. | ||
+ | |||
+ | <WRAP left round help 100%> | ||
+ | * What is the function | ||
+ | * What is the period of message sending? Explain the implementation choice. | ||
+ | * Is this period guaranteed according to the LoRaWAN specification? | ||
+ | </ | ||
+ | |||
+ | Now you are ready to compile the sketch and upload it to the LoRaWAN device. Connect the device a USB port on your PC, choose the board type as '' | ||
+ | |||
+ | <WRAP left round tip 100%> | ||
+ | For Arduino Mega 2560, additional drivers can be installed on Windows from http:// | ||
+ | </ | ||
+ | |||
+ | Open the serial monitor in the Arduino IDE at 115200 baud and analyse the debug messages. | ||
+ | |||
+ | <WRAP left round help 100%> | ||
+ | * 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, | ||
+ | You can use mqtt-spy to debug the messages received from the LoRaWAN devices. The tool is provided at the beginning of the challenge. After starting the application, | ||
+ | |||
+ | <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 '' | ||
+ | |||
+ | < | ||
+ | { | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | " | ||
+ | } | ||
</ | </ | ||
+ | ===== -. Day One 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 when used after the join event: | ||
- | The message containing the sensor values is transmitted on one of the radio channels: | ||
<code c++> | <code c++> | ||
- | LMIC_setTxData2(1, (uint8_t*) buffer, message.length() , 0); | + | LMIC_disableChannel(N); |
+ | LMIC_setDrTxpow(DR_SF12,14); | ||
</ | </ | ||
- | ===== -. Applications | + | ==== -. The Sensor Challenge ==== |
- | 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 | + | I can use different sensors to send data from the device: PIR, moisture, temperature, |
- | You can use mqtt-spy to debug the messages received from the LoRaWAN devices. For this, you should download the software tool from [[https://github.com/eclipse/paho.mqtt-spy/ | + | |
+ | ===== -. Day Two Challenges | ||
+ | |||
+ | ==== -. The Wind Rises ==== | ||
+ | |||
+ | This is a mandatory challenge. It consists | ||
+ | |||
+ | ^ Provided material ^ | ||
+ | | VM with Node-RED installed | | ||
+ | | {{ : | ||
+ | | [[https://emoncms.org/dashboard/view& | ||
+ | |||
+ | ^ Required skills ^ | ||
+ | | Basic javascript | | ||
+ | | GUI configuration | | ||
+ | | Two drops of IoT design | | ||
+ | ==== -. Nausicaa Challenge ==== | ||
+ | |||
+ | You have to take control on the devices. Use some scripting | ||
+ | |||
+ | ^ Required skills ^ | ||
+ | | {{ : | ||
+ | | Basic electronics | | ||
+ | | Two drops of IoT autocracy | | ||
+ | |||
+ | ==== -. Totoro Challenge ==== | ||
+ | |||
+ | You have to store the sensor data in a database. Use Node-RED | ||
+ | |||
+ | ^ Required skills ^ | ||
+ | | Basic database | | ||
+ | | Two drops of IoT resilience | | ||
+ | |||
+ | ==== -. Kiki Challenge ==== | ||
+ | |||
+ | You have to implement a radio coverage test on the campus. | ||
+ | |||
+ | ^ Required skills ^ | ||
+ | | Basic scripting | | ||
+ | | Two drops of IoT ubiquity | | ||
+ | ==== -. Mononoke Challenge ==== | ||
+ | |||
+ | You have to implement a chat bot designed for working with Google Hangouts. The bot answers requests and reveals sensors data. | ||
+ | |||
+ | |||
+ | ^ Required skills ^ | ||
+ | | Basic scripting with python | | ||
+ | | Two drops of IoT robot attitude | |
esib_iot_challenge.txt · Last modified: 2021/08/28 09:53 by samer