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| en:iot-open:practical:hardware:sut:esp32:iot_5 [2024/04/28 17:03] – [Task to be implemented] pczekalski | en:iot-open:practical:hardware:sut:esp32:iot_5 [2024/05/01 13:28] (current) – [Start] pczekalski | ||
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| * method PUT - should set the LED on and off, with the expected payload being " | * method PUT - should set the LED on and off, with the expected payload being " | ||
| - | <todo @pczekalski>Skończyć</todo> | + | ==== Start ==== |
| + | Check if you can clearly see a full display (of your choice) in your video stream. Book a device and create a dummy Arduino file with '' | ||
| + | Implement a connection to the " | ||
| + | |||
| + | === Step 1 === | ||
| + | Refer to the hardware documentation and ensure an understanding of the network infrastructure you're interfacing with.\\ | ||
| + | Implement the code to display on the selected device.\\ | ||
| + | Connect to the WiFi in the STA mode (as a client) and ensure the connection is OK and you got an IP from the DHCP server.\\ | ||
| + | It is essential to note and present (using a display of your choice) the node's IP address, as you will later need to refer to it with a client to use your service. | ||
| + | |||
| + | === Step 2 === | ||
| + | Include the WiFi UDP and CoAP implementation libraries headers in your code: | ||
| + | <code c> | ||
| + | #include < | ||
| + | #include < | ||
| + | </ | ||
| + | WiFi UDP is part of the Arduino for the ESP32 framework, so you do not need to add it explicitly to the '' | ||
| + | |||
| + | === Step 3 === | ||
| + | Declare necessary constants, etc.: | ||
| + | <code c> | ||
| + | bool LEDSTATE; //Keep LED's state. | ||
| + | </ | ||
| + | |||
| + | === Step 4 === | ||
| + | Declare communication objects: | ||
| + | <code c> | ||
| + | WiFiUDP udp; //UDP Communication class | ||
| + | Coap coap(udp); | ||
| + | </ | ||
| + | |||
| + | === Step 5 === | ||
| + | Declare function prototypes (not necessary if you implement them in the correct order): | ||
| + | <code c> | ||
| + | void callback_response(CoapPacket & | ||
| + | // CoAP server endpoint URL callback for GET and PUT methods | ||
| + | void callback_led(CoapPacket & | ||
| + | </ | ||
| + | |||
| + | === Step 6 === | ||
| + | Implement them: | ||
| + | <code c> | ||
| + | void callback_led(CoapPacket & | ||
| + | // send response | ||
| + | char p[packet.payloadlen + 1]; | ||
| + | memcpy(p, packet.payload, | ||
| + | p[packet.payloadlen] = NULL; | ||
| + | |||
| + | String message(p); | ||
| + | //for GET | ||
| + | if (message.equals(" | ||
| + | LEDSTATE = false; | ||
| + | else if(message.equals(" | ||
| + | LEDSTATE = true; | ||
| + | //for PUT | ||
| + | if (LEDSTATE) { | ||
| + | coap.sendResponse(ip, | ||
| + | } else { | ||
| + | digitalWrite(RGBLED_R_PIN, | ||
| + | coap.sendResponse(ip, | ||
| + | } | ||
| + | } | ||
| + | </ | ||
| + | <code c> | ||
| + | void callback_response(CoapPacket & | ||
| + | char p[packet.payloadlen + 1]; | ||
| + | memcpy(p, packet.payload, | ||
| + | p[packet.payloadlen] = NULL; | ||
| + | //Do something with payload, e.g. print it to the display | ||
| + | } | ||
| + | </ | ||
| + | |||
| + | === Step 7 === | ||
| + | Setup CoAP services: | ||
| + | <code c> | ||
| + | coap.server(callback_led, | ||
| + | coap.response(callback_response); | ||
| + | coap.start(); | ||
| + | </ | ||
| + | |||
| + | === Setup 8 === | ||
| + | Process CoAP services in the '' | ||
| + | <code c> | ||
| + | delay(1000); | ||
| + | coap.loop(); | ||
| + | </ | ||
| + | < | ||
| + | |||
| + | ==== Result validation ==== | ||
| + | You should be able to connect to the WiFi and set up a CoAP service. Depending on whether you're fully remote or able to access our networks with an additional device, you need to implement a CoAP client on another laboratory node (as present in the scenario [[[en: | ||
| + | |||
| + | <note tip> | ||
| + | <code bash> | ||
| + | $ coap-client -e " | ||
| + | </ | ||
| + | </ | ||
| + | |||
| + | <note tip> | ||
| + | <code bash> | ||
| + | $ coap-client -m get coap:// | ||
| + | </ | ||
| + | </ | ||
| + | |||
| + | |||
| + | ===== FAQ ===== | ||
| + | **How do I implement a client to my CoAP service?**: If you're fully remote, the only option is to implement a client on your own - use another laboratory node and scenario [[[en: | ||
| + | |||
| + | <WRAP noprint> | ||
| + | ===== Project information ===== | ||
| + | {{: | ||
| + | This Intellectual Output was implemented under the Erasmus+ KA2.\\ | ||
| + | Project IOT-OPEN.EU Reloaded – Education-based strengthening of the European universities, | ||
| + | Project number: 2022-1-PL01-KA220-HED-000085090. | ||
| + | |||
| + | **__Erasmus+ Disclaimer__**\\ | ||
| + | This project has been funded with support from the European Commission. \\ | ||
| + | This publication reflects the views of only the author, and the Commission cannot be held responsible for any use that may be made of the information contained therein. | ||
| + | |||
| + | **__Copyright Notice__**\\ | ||
| + | This content was created by the IOT-OPEN.EU Reloaded consortium, 2022, | ||
| + | The content is Copyrighted and distributed under CC BY-NC [[https:// | ||
| + | <figure label> | ||
| + | {{: | ||
| + | </ | ||
| + | |||
| + | </WRAP> | ||
