![void WiFiServer::disconnect() {
WiFiClass::_state[_sock] = -1;
WiFiClass::_server_port[_sock] = 0;
}](https://image.slidesharecdn.com/arduinopresentation-140417150912-phpapp01/85/The-Arduino-WiFi-Shield-37-320.jpg)
![void WiFiServer::disconnect() {
WiFiClass::_state[_sock] = -1;
WiFiClass::_server_port[_sock] = 0;
}](https://image.slidesharecdn.com/arduinopresentation-140417150912-phpapp01/85/The-Arduino-WiFi-Shield-38-320.jpg)
![void WiFiServer::disconnect() {
WiFiClass::_state[_sock] = -1;
WiFiClass::_server_port[_sock] = 0;
}](https://image.slidesharecdn.com/arduinopresentation-140417150912-phpapp01/85/The-Arduino-WiFi-Shield-39-320.jpg)
![void WiFiServer::disconnect() {
WiFiClass::_state[_sock] = -1;
WiFiClass::_server_port[_sock] = 0;
}](https://image.slidesharecdn.com/arduinopresentation-140417150912-phpapp01/85/The-Arduino-WiFi-Shield-40-320.jpg)
The Arduino WiFi Shield
- 1. The Arduino WiFi Shield Katrina Ellison Geltman March 27, 2014
- 2. Arduino UNO R3 Arduino WiFi Shield
- 3. Arduino UNO R3 Arduino WiFi Shield
- 4. + vs.
- 5. + vs.
- 6. How it Works
- 8. In the beginning, you have: WiFi ShieldComputer WiFi Router Arduino
- 9. You set up the basics. WiFi ShieldComputer WiFi Router Arduino WiFi driver Server object
- 10. You request to connect to the network. WiFi ShieldComputer WiFi Router Arduino WiFi driver Request to connect Server object
- 11. If you’re lucky, you connect successfully. WiFi ShieldComputer WiFi Router Arduino WiFi driverConnection successful Request to connect Server object
- 12. You start your server. WiFi ShieldComputer WiFi Router Arduino Server object Start TCP server listening on socket/port
- 13. Now it’s listening on a particular port. WiFi ShieldComputer WiFi Router Arduino Server object
- 14. You’re ready to go!
- 16. After setup, everything happens in an event loop. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop
- 17. At the beginning of the loop, a client object is created using the server’s port & socket. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object
- 18. The client asks the WiFi shield whether it’s active or not. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object What's my state?
- 19. If there haven’t been any requests, the client stays inactive. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Inactive The event loop ends and re-starts.
- 20. If there haven’t been any requests, the client stays inactive. ! ! The event loop ends and re-starts. ! I think the client is deleted, but I’m not sure how. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop
- 21. If a request has been made, the client activates. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Client object Connected! Request!
- 22. Your code asks the client object for whatever data it’s receiving from your computer. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Client object Connected! Request! Data?
- 23. If there is data, it reads it and processes it. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Client object Read data Request! Read data
- 24. (This is when your Arduino actually does something) WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Client object Read data Request! Read data
- 25. Then the event loop ends and the client is deleted. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop
- 26. ! Then the event loop ends and the client is deleted. (I think) WiFi ShieldComputer WiFi Router Arduino Server object Your code loop Client object Inactive
- 27. That’s all good
- 28. How it goes wrong
- 29. Bad things happen if you disconnect from the network. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop
- 30. The server doesn’t reconnect properly when the network reconnects. WiFi ShieldComputer WiFi Router Arduino Server object Your code loop
- 31. We know this from our debugging output. Socket Port Server Status Client Status -1 0 0 0
- 32. We know this from our debugging output. Socket Port Server Status Client Status -1 0 0 0 0 80 0 0
- 33. We know this from our debugging output. Socket Port Server Status Client Status -1 0 0 0 0 80 0 0 Still active!
- 34. We know this from our debugging output. Socket Port Server Status Client Status -1 0 0 0 0 80 0 0 No server!
- 35. How to fix it
- 36. Manually release port & socket
- 37. void WiFiServer::disconnect() { WiFiClass::_state[_sock] = -1; WiFiClass::_server_port[_sock] = 0; }
- 38. void WiFiServer::disconnect() { WiFiClass::_state[_sock] = -1; WiFiClass::_server_port[_sock] = 0; }
- 39. void WiFiServer::disconnect() { WiFiClass::_state[_sock] = -1; WiFiClass::_server_port[_sock] = 0; }
- 40. void WiFiServer::disconnect() { WiFiClass::_state[_sock] = -1; WiFiClass::_server_port[_sock] = 0; }
- 42. Socket Port Server Status Client Status -1 0 0 0 0 80 1 0
- 43. It works!
- 45. It doesn’t work if a client object has ever been created
- 46. It doesn’t work if a client object has ever been created This makes it useless!
- 47. It doesn’t work if a client object has ever been created usually This makes it useless!
- 49. But available memory does not change from loop to loop.
- 50. I don’t really know C++
- 52. So I would love to hear your ideas
- 53. But whether or not you can help
- 54. Your main takeaway should be
- 55. Arduino UNO R3 Arduino WiFi Shield