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Changes for page 2 Script

Last modified by Devin Chen on 2025/06/06 14:03
From version 38.1
edited by Hunter
on 2023/03/17 14:43
Change comment: There is no comment for this version
To version 41.1
edited by Hunter
on 2023/03/17 18:05
Change comment: There is no comment for this version

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... ... @@ -474,6 +474,25 @@
474 474  
475 475  == **2.1 V-Box connect with test server(General Example)** ==
476 476  
477 +The following example is trying to publish to the topic "testtopic/test/no1/7890", and subscribe the topic "testtopic/test/no1/123456".
478 +
479 +And the JSON message is like follows:
480 +
481 +{{code language="JSON"}}
482 +{
483 + "timestamp": 1631152760,
484 + "messageId": 1,
485 + "event": "test_data",
486 + "mfrs": "HMI/box",
487 + "data":
488 + {
489 + "id" : 1436217747670454274,
490 + "waterlevel" : 48,
491 + "temperture" : 23
492 + }
493 +}
494 +{{/code}}
495 +
477 477  {{code language="lua"}}
478 478  --MQTT configuration table
479 479  local MQTT_CFG={}
... ... @@ -515,9 +515,13 @@
515 515  --initialize mqtt
516 516  function mqtt_init()
517 517   print(string.format("mqtt init mqtt_url:%s mqtt_clientid:%s", MQTT_URL, MQTT_CLIENT_ID))
537 + if g_mq then
538 + mqtt.close() --Close mqtt object
539 + end
518 518   g_mq, err = mqtt.create(MQTT_URL, MQTT_CLIENT_ID) -- create mqtt object,and declare it as a global variable
519 519   if g_mq then
520 520   g_mq:on("message", mqtt_msg_callback) -- Register a callback for receiving messages
543 + g_mq:on("offline", mqtt_msg_offline) -- Register a callback for offline
521 521   print("mqtt init success")
522 522   else
523 523   print("mqtt init failed:", err)
... ... @@ -537,6 +537,11 @@
537 537   g_mq:subscribe(SUBSCRIBE_TOPIC, 0)
538 538  end
539 539  
563 +--Offline callback function
564 +function mqtt_msg_offline(cause)
565 + print("mqtt offline, cause:", cause)
566 +end
567 +
540 540  -- Received message callback function
541 541  function mqtt_msg_callback(topic, msg)
542 542   print("topic:", topic)
... ... @@ -575,9 +575,11 @@
575 575   if g_mq:isconnected() then
576 576   send_data()
577 577   else
578 - --if exceed 20 sec not connect, reconnect once
579 - if os.time() - LAST_TIME > 20 then
606 + --if exceed 5 sec not connect, reconnect once
607 + if os.time() - LAST_TIME > 5 then
580 580   LAST_TIME = os.time()
609 + --reinitial the mqtt object
610 + mqtt_init()
581 581   --connect to mqtt or reconnect
582 582   mqtt_connect()
583 583   end