![](/media/cache/profiles/0230db486bc9cdd3583fee20469c7b2f.jpg.50x50_q85.jpg)
Simple usage example of MQTTS library
Dependencies: EthernetInterface MQTTS NTPClient SDFileSystem mbed-rtos mbed wolfSSL
Fork of HelloMQTT by
MQTT is light weight protocol for M2M, IoT. MQTTS adds TLS(SSL) security layer into the MQTT. This program shows simple usage example of MQTTS library.
Connect information has to be stored in SD file "connectInfo.txt", with following lines in it.
- Host Name
- User Name
- Password
- Client ID
- Topic
The program asks following information on the terminal
- Port Number to be connected. If the port is >8000 it assumes MQTTS.
- Message to be published
- Certificate file name, if MQTTS. Input file name on SD card. Simply Return key force it to no server verification. The program set up the realtime clock by NTP for certificate verification.
This program was tested with FRDM-K64F, against Sango MQTT server by Shiguredo. https://sango.shiguredo.jp/
References:
- wolfSSL Home: https://www.wolfssl.com
- Original work of MQTT: https://developer.mbed.org/teams/mqtt.
- 日本語ホーム:https://developer.mbed.org/users/wolfSSL/code/HelloMQTTS/wiki/MQTTSホーム
Diff: main.cpp
- Revision:
- 8:a3e3113054a1
- Parent:
- 7:3de634f2d40c
- Child:
- 9:5beb8609e9f7
--- a/main.cpp Sun May 11 19:17:05 2014 +0000 +++ b/main.cpp Tue May 20 15:08:05 2014 +0000 @@ -24,17 +24,16 @@ */ -#include "mbed.h" -#include "EthernetInterfaceIPStack.h" #include "C12832.h" C12832 lcd(p5, p7, p6, p8, p11); -#include "FP.cpp" +#include "MQTTEthernet.h" #include "MQTTClient.h" int arrivedcount = 0; + void messageArrived(MQTT::Message* message) { lcd.cls(); @@ -46,17 +45,16 @@ } - int main(int argc, char* argv[]) { - IPStack ipstack = IPStack(); - float version = 0.43; + MQTTEthernet ipstack = MQTTEthernet(); + float version = 0.46; char* topic = "mbed-sample"; lcd.printf("Version is %f\n", version); printf("Version is %f\n", version); - MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack); + MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack); char* hostname = "m2m.eclipse.org"; int port = 1883; @@ -67,15 +65,12 @@ MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = 3; - data.clientID.cstring = "mbed-icraggs"; - rc = client.connect(&data); - if (rc != 0) + data.clientID.cstring = "mbed-sample"; + if ((rc = client.connect(&data)) != 0) lcd.printf("rc from MQTT connect is %d\n", rc); - rc = client.subscribe(topic, MQTT::QOS1, messageArrived); - if (rc != 0) { - printf("rc from MQTT subscribe is %d\n", rc); - } + if ((rc = client.subscribe(topic, MQTT::QOS1, messageArrived)) != 0) + lcd.printf("rc from MQTT subscribe is %d\n", rc); MQTT::Message message; @@ -107,21 +102,17 @@ while (arrivedcount == 2) client.yield(100); - rc = client.unsubscribe(topic); - if (rc != 0) { + if ((rc = client.unsubscribe(topic)) != 0) printf("rc from unsubscribe was %d\n", rc); - } - rc = client.disconnect(); - if (rc != 0) { + if ((rc = client.disconnect()) != 0) printf("rc from disconnect was %d\n", rc); - } ipstack.disconnect(); lcd.cls(); lcd.locate(0,3); - lcd.printf("Finish: %d msgs\n", arrivedcount); + lcd.printf("Version %.2f: finish %d msgs\n", version, arrivedcount); printf("Finishing with %d messages received\n", arrivedcount); return 0;