83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
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MySQL Connector/Arduino Example : reboot if connection lost
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This example demonstrates how to reboot an Arduino if connection to the
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server is lost for a period of time.
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For more information and documentation, visit the wiki:
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https://github.com/ChuckBell/MySQL_Connector_Arduino/wiki.
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INSTRUCTIONS FOR USE
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1) Change the address of the server to the IP address of the MySQL server
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2) Change the user and password to a valid MySQL user and password
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3) Connect a USB cable to your Arduino
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4) Select the correct board and port
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5) Compile and upload the sketch to your Arduino
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6) Once uploaded, open Serial Monitor (use 115200 speed) and observe
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To test the reboot, unplug your Ethernet cable once you see "disconnected"
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then wait for the timeout. Once the Arduino reboots, plug the cable in again
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and you should see the query processing resume.
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Created by: Dr. Charles A. Bell
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*/
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#include <Ethernet.h>
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#include <MySQL_Connection.h>
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#include <MySQL_Cursor.h>
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byte mac_addr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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IPAddress server_addr(10,0,1,35); // IP of the MySQL *server* here
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char user[] = "root"; // MySQL user login username
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char password[] = "secret"; // MySQL user login password
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EthernetClient client;
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MySQL_Connection conn((Client *)&client);
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MySQL_Cursor cur = MySQL_Cursor(&conn);
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void setup() {
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Serial.begin(115200);
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while (!Serial); // wait for serial port to connect
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Ethernet.begin(mac_addr);
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}
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// Begin reboot code
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int num_fails; // variable for number of failure attempts
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#define MAX_FAILED_CONNECTS 5 // maximum number of failed connects to MySQL
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void soft_reset() {
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asm volatile("jmp 0");
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}
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// End reboot code
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void loop() {
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Serial.println("Sleeping...");
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delay(1000);
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if (conn.connected()) {
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Serial.println("Running a query");
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cur.execute("SHOW DATABASES"); // execute a query
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cur.show_results(); // show the results
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cur.close(); // close the cursor
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conn.close(); // close the connection
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num_fails = 0; // reset failures
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delay(3000);
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} else {
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Serial.println("Connecting...");
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if (conn.connect(server_addr, 3306, user, password)) {
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delay(500);
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} else {
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num_fails++;
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Serial.println("Connect failed!");
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if (num_fails == MAX_FAILED_CONNECTS) {
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Serial.println("Ok, that's it. I'm outta here. Rebooting...");
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delay(2000);
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// Here we tell the Arduino to reboot by redirecting the instruction
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// pointer to the "top" or position 0. This is a soft reset and may
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// not solve all hardware-related lockups.
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soft_reset();
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}
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}
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}
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}
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