Niels Balemans
/
PGO6_VoteController_Niels_Balemans_
vote controller
Fork of PGO6_VoteController_template by
main.cpp
- Committer:
- niels_balemans
- Date:
- 2018-10-11
- Revision:
- 3:062b94b59b1b
- Parent:
- 2:5b7d055dbc91
- Child:
- 4:836cd4df41ba
File content as of revision 3:062b94b59b1b:
#define APP_VERSION 0.6f #define MQTT_VERSION 3 #define BROKER_NAME "broker.hivemq.com" #define BROKER_PORT 1883 #include "debounce_button.h" #include "EthernetInterface.h" #include "MQTTNetwork.h" #include "MQTTmbed.h" #include "MQTTClient.h" /** TODO ---- - Check if the button has been pressed. If so, print the amount of clicks to a serial terminal. - Make an MQTT-service which: - starts up a network using EthernetInterface. Make sure the development board requests its address via DHCP. - makes a client and connects it to the broker using a client ID and credentials (username & password). - sends messages at the same topic as the smartphone app from PGO 2. Feel free to choose which Quality of Service you are going to use. Make a separate function which handles the sending procedure. Therefore, this function can be called each time we want to send a certain message. - When the button is pressed once, we send an upvote. When pressed twice, a downvote is sent. By pressing 4 times, the program disconnects from the broker and terminates. Extra ----- - Subscribe to the topic on which the song data is published. Display this received message on the serial terminal. - Test this controller in the complete system of PGO 2. Use these controllers instead of the smartphones. Tips & tricks ------------- - To generate an interrupt on the press of a button, use: InterruptIn button(USER_BUTTON); ... button.fall(callback(someFunction)); - Before implementing MQTT, test the multiclick feature first. - Have a look at the MQTT-library for Mbed and the HelloMQTT-example. - To have a uniform message sending procedure, use the following function usage: sendMessage(&client, topic, buf, qos, retained, duplicate) */ char* topic; //char* buf; InterruptIn button1(USER_BUTTON); void sendMessage(MQTT::Client<MQTTNetwork, Countdown> &client, char* topic, char* msg, bool retained, bool dup) { char buf[100]; sprintf(buf, msg); MQTT::Message message; message.qos = MQTT::QOS0; message.retained = retained; message.dup = dup; message.payload = (void*)buf; message.payloadlen = strlen(buf)+1; client.publish(topic, message); } int main(int argc, char* argv[]) { printf("Starting vote controller...\n\r"); button1.fall(callback(button1_onpressed_cb)); EthernetInterface eth; eth.connect(); printf("Ethernet initialized: IP %s\n\r", eth.get_ip_address()); MQTTNetwork mqtt(ð); MQTT::Client<MQTTNetwork, Countdown> client(mqtt); int rc = mqtt.connect(BROKER_NAME, BROKER_PORT); if(rc != 0) { printf("MQTT connection failed!\r\n"); } MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = MQTT_VERSION; data.clientID.cstring = "BIEEEER"; data.username.cstring = "niels"; data.password.cstring = "niels"; rc = client.connect(data); if(rc != 0) { printf("Client connection failed!\n\r"); } topic = "niels"; bool running = true; while(running) { if(multiclick_state != 0) { //printf("%d\n\r", multiclick_state); switch(multiclick_state) { case 1: printf("Upvoting\n\r"); sendMessage(client, topic, "upvote", false, false); break; case 2: printf("Downvoting\n\r"); sendMessage(client, topic, "downvote", false, false); break; case 4: printf("Terminating\n\r"); running = false; mqtt.disconnect(); break; default: break; } multiclick_state = 0; } } return 0; }