# Sending file over mqtt using mqttClient-for-Legato **URL:** \ **Category:** Uncategorized\ **Created:** [December 3, 2020, 6:16pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773 "2020-12-03T18:16:21Z")\ **Posts on this page:** 17\ **Page:** 3
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 17, 2023, 12:59pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/41 "2023-10-17T12:59:35Z")
sir the procedure is i have to git clone this to myworkspace and i will enable the leaf shell and run the mktool command wrigtht ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 17, 2023, 1:01pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/42 "2023-10-17T13:01:54Z")
Then why does it still ask for datahub? ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 17, 2023, 1:05pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/43 "2023-10-17T13:05:15Z")
i changed only publish and subscribe.c files but don,t know why it is happening like this ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 17, 2023, 1:23pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/44 "2023-10-17T13:23:41Z")
You can see there is no datahub in the adef file ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 17, 2023, 1:25pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/45 "2023-10-17T13:25:24Z")
yes it is not there,i have checked it ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 17, 2023, 1:43pm UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/46 "2023-10-17T13:43:36Z")
Clear the project or create a new one and retry BTW, you should just compile the adef instead of sdef, the sdef is pointing to other location: > ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 7:33am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/47 "2023-10-18T07:33:06Z")
sir i have copiled .adef and successfull .update file generated and application is running successfully in board also, but it is not connecting to mqtt , it is not showing error also , what may be the reason could u help ! this is my mqttPublish .c fle /\*\* - @file testPublisher.c - - MQTT Publisher sample application - - * * * - - Copyright (C) Sierra Wireless Inc. - \*/ #include “legato.h” #include “interfaces.h” //-------------------------------------------------------------------------------------------------- /\*\* - Whether connection to MQTT server is secured \*/ //-------------------------------------------------------------------------------------------------- #define MQTT\_SERVER\_USE\_SECURED\_CONNECTION 0 //-------------------------------------------------------------------------------------------------- /\*\* - Device IMEI, used as a unique device identifier \*/ //-------------------------------------------------------------------------------------------------- char DeviceIMEI[LE\_INFO\_IMEI\_MAX\_BYTES]; //-------------------------------------------------------------------------------------------------- /\*\* - MQTT session reference \*/ //-------------------------------------------------------------------------------------------------- mqtt\_SessionRef\_t MQTTSession; //-------------------------------------------------------------------------------------------------- /\*\* - Call-back function called on lost connection _/ //-------------------------------------------------------------------------------------------------- static void OnConnectionLost ( void_ context ) { LE\_ERROR(“Connection lost!”); } //-------------------------------------------------------------------------------------------------- /\*\* - Call-back function called on arrived message _/ //-------------------------------------------------------------------------------------------------- static void OnMessageArrived ( const char_ topic, const uint8\_t\* payload, size\_t payloadLen, void\* context ) { LE\_ERROR(“The publisher received a message!”); } //-------------------------------------------------------------------------------------------------- /\*\* - Timer handler for periodically publishing data _/ //-------------------------------------------------------------------------------------------------- static void PublishTimerHandler ( le\_timer\_Ref\_t timer ) { static int messageData = 0; uint8\_t payload[64]; snprintf((char_)payload, sizeof(payload), “{"value":%d}”, messageData); size\_t payloadLen = strlen((char\*)payload); const bool retain = false; char publishTopic = “v1/devices/me/telemetry”; snprintf(publishTopic, sizeof(publishTopic), “%s/messages/json”, DeviceIMEI); const le\_result\_t publishResult = mqtt\_Publish( MQTTSession, publishTopic, payload, payloadLen, MQTT\_QOS0\_TRANSMIT\_ONCE, retain); LE\_INFO(“Published Topic %s data %s result %s”, publishTopic, payload, LE\_RESULT\_TXT(publishResult)); messageData++; } COMPONENT\_INIT { // server is running on the Linux workstation connected to the target #if MQTT\_SERVER\_USE\_SECURED\_CONNECTION const char mqttBrokerURI = “ssl://192.168.2.3:8883”; const uint8\_t mqttPassword = {‘S’, ‘W’, ‘I’}; #else const char mqttBrokerURI = “[phycluds.com:1884](http://phycluds.com:1884)”; #endif ``` LE_ASSERT_OK(le_info_GetImei(DeviceIMEI, NUM_ARRAY_MEMBERS(DeviceIMEI))); char clientId[32]; snprintf(clientId, sizeof(clientId), "%s-pub", DeviceIMEI); LE_ASSERT_OK(mqtt_CreateSession(mqttBrokerURI, clientId, &MQTTSession)); const uint16_t keepAliveInSeconds = 60; const bool cleanSession = true; const char* username = "GCbrAhbMVyCR2DFwWht0"; const uint16_t connectTimeout = 20; const uint16_t retryInterval = 10; mqtt_SetConnectOptions( MQTTSession, keepAliveInSeconds, cleanSession, username, ``` #if MQTT\_SERVER\_USE\_SECURED\_CONNECTION mqttPassword, NUM\_ARRAY\_MEMBERS(mqttPassword), #else NULL, 0, #endif connectTimeout, retryInterval); ``` mqtt_AddConnectionLostHandler(MQTTSession, &OnConnectionLost, NULL); mqtt_AddMessageArrivedHandler(MQTTSession, &OnMessageArrived, NULL); int rc = mqtt_Connect(MQTTSession); if (rc != LE_OK) { LE_ERROR("Connection failed! error %d", rc); } else { LE_INFO("Connected to server '%s'", mqttBrokerURI); le_timer_Ref_t timer = le_timer_Create("MQTT Publish"); LE_ASSERT_OK(le_timer_SetHandler(timer, &PublishTimerHandler)); LE_ASSERT_OK(le_timer_SetMsInterval(timer, 10000)); LE_ASSERT_OK(le_timer_SetRepeat(timer, 0)); LE_ASSERT_OK(le_timer_Start(timer)); LE_INFO("Publish timer started"); } ``` } ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 7:37am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/48 "2023-10-18T07:37:31Z")
[mango-log](https://mangoh.discourse.group/uploads/short-url/dvMZGuSOynIM5xEODiM640DCc23) (6.6 KB) sir this is the log file uploaded on that publisher.adef ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 18, 2023, 7:44am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/49 "2023-10-18T07:44:39Z")
can you print a helloworld out first? You need to debug by yourself! ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 7:50am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/50 "2023-10-18T07:50:09Z")
yeah i have writen hellowold application and it is running successfully ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 18, 2023, 7:56am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/51 "2023-10-18T07:56:01Z")
the put the code in your application’s first function Other user can make it work: > [@mqttClient Service Connect error?](https://mangoh.discourse.group/t/mqttclient-service-connect-error/9093): > > Hi! I’m developing a SW to connect with mosquitto broker. I started from the source code in apps/platformservices of Legato environment. I can right build the project, create the session, but I have problem when I have to connect to the broker: [image] I’m trying to connect without user and password (I’m beginning!) and this is the result: Obviously I connected my mangOH green to internet thought both WiFi and Sim. Which could be the problem? ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 8:36am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/52 "2023-10-18T08:36:53Z")
sir , i did’t get what you are saying ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 18, 2023, 8:38am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/53 "2023-10-18T08:38:16Z")
did your program start the component\_init()? ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 8:43am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/54 "2023-10-18T08:43:00Z")
in log it is not showing anything related to component initialization, above i have attached the log ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 18, 2023, 8:44am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/55 "2023-10-18T08:44:04Z")
that is why i ask you to print a helloworld message in component\_init() This is some basic debug skill … ---
**Author:** ![nayanhn](https://avatars.discourse-cdn.com/v4/letter/n/e47c2d/32.png) [@nayanhn](https://mangoh.discourse.group/u/nayanhn)\ **Post date:** [October 18, 2023, 8:59am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/56 "2023-10-18T08:59:47Z")
i added this line in component init() LE\_INFO(“Hello, World!”); but in log it is not showing anything ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 18, 2023, 9:43am UTC](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773/57 "2023-10-18T09:43:14Z")
your hello world app is working fine, right? Then you can port the mqtt app to your helloworld app line by line [Previous page](https://mangoh.discourse.group/t/sending-file-over-mqtt-using-mqttclient-for-legato/5773.md?page=2)