{"id":11,"date":"2025-03-28T13:39:25","date_gmt":"2025-03-28T13:39:25","guid":{"rendered":"http:\/\/www2.gimasi.com\/?docs=the-level-meter\/section-1\/article-3"},"modified":"2025-03-28T13:39:25","modified_gmt":"2025-03-28T13:39:25","slug":"article-3","status":"publish","type":"docs","link":"https:\/\/www.gimasi.com\/?docs=the-level-meter\/section-1\/article-3","title":{"rendered":"IoT Connectivity"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text css=\\”\\”]<\/p>\n

The Level Meter<\/strong> is a sophisticated device used for monitoring environmental and industrial conditions, such as temperature<\/strong>, motion<\/strong>, and location-based data<\/strong>. It has multiple sensors and connectivity options that enable seamless communication with cloud platforms and other devices.<\/p>\n

Communication Technologies<\/strong><\/h4>\n
    \n
  • Wi-Fi or Cellular (LTE\/5G)<\/strong>: The Level Meter can use Wi-Fi or cellular networks (via an embedded SIM module) to transmit data to a cloud platform, allowing remote monitoring and real-time analytics.<\/li>\n
  • MQTT<\/strong>: Lightweight messaging protocol used for efficient communication. It allows the Level Meter to send data to the cloud with minimal overhead and quick response times.<\/li>\n
  • LoRa<\/strong>: In remote or rural areas, LoRa connectivity can be used to transmit data over long distances with low power consumption. The Level Meter can leverage this technology in areas where traditional cellular coverage may be limited.<\/li>\n
  • OTA Connectivity<\/strong><\/li>\n
  • LTE NB-IoT<\/strong>: Cat NB2: B1\/B2\/B3\/B4\/B5\/B8\/B12\/B13\/B17\/ B18\/B19\/B20\/B25\/B28\/B66\/B70\/B85<\/li>\n<\/ul>\n
    \n

    LoRa Connectivity<\/h4>\n
      \n
    • Used for environmental monitoring, asset tracking, and container-level detection<\/strong>.<\/li>\n
    • Transmits sensor data (temperature, motion, battery level, etc.) at scheduled<\/strong> intervals.<\/li>\n
    • Can trigger alarms based on threshold values<\/strong> (e.g., low battery, missing measurement, geofence violation).<\/li>\n<\/ul>\n

      Example of LoRa Payload<\/strong><\/h4>\n
      {\n\\\"device_id\\\":<\/span> \\\"LM123456\\\"<\/span>,<\/span><\/span>\n\\\"timestamp\\\":<\/span> 1711532400,<\/span><\/span>\n\\\"temperature\\\":<\/span> 23.4,<\/span><\/span>\n\\\"motion_detected\\\":<\/span> true<\/span>,<\/span><\/span>\n\\\"battery_level\\\":<\/span> 78,<\/span><\/span>\n\\\"signal_strength\\\":<\/span> -85<\/span>\n}<\/pre>\n
      LoRaWAN supports different communication classes based on device requirements:<\/p>\n
      \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n
       
      Mode<\/strong><\/th>\nDescription<\/strong><\/th>\nUse Case (Device)<\/strong><\/th>\n<\/tr>\n<\/thead>\n
      Class A<\/strong><\/td>\nUltra-low power, devices communicate only when sending data<\/td>\nIdeal for battery-powered Level Meter & LCT<\/td>\n<\/tr>\n
      Class B<\/strong><\/td>\nScheduled reception windows for downlink messages<\/td>\nUseful when periodic commands are needed<\/td>\n<\/tr>\n
      Class C<\/strong><\/td>\nAlways listening, consumes more power<\/td>\nUsed for real-time control (not recommended for LM & LCT)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
      \n
      OTA Updates for Level Meter<\/strong><\/h3>\n
      The Level Meter<\/strong> is a sophisticated device with a variety of sensors (such as temperature, motion, and accelerometer). OTA updates ensure that the device can be remotely updated with new features, bug fixes, or security patches without requiring physical access.<\/p>\n
      How OTA Works for Level Meter:<\/strong><\/h4>\n
        \n
      1. \n
        Firmware Update Process<\/strong>:<\/p>\n
          \n
        • The device periodically checks a cloud server (or another designated source) for available firmware updates.<\/li>\n
        • When an update is available, the Level Meter establishes a secure connection to the server and downloads the update.<\/li>\n
        • The update is validated (via checksums, digital signatures) to ensure integrity and authenticity.<\/li>\n
        • The firmware update is then installed, and the device reboots to apply the new firmware.<\/li>\n
        • If needed, the device can be configured remotely to adapt to the new features or settings introduced by the update.<\/li>\n<\/ul>\n<\/li>\n
        • \n
          Update Methods<\/strong>:<\/p>\n
            \n
          • MQTT (Message Queuing Telemetry Transport)<\/strong>: Used for lightweight communication between the Level Meter and the cloud. The update command can be sent via an MQTT topic, signaling the device to download and install the firmware update.<\/li>\n
          • HTTP\/HTTPS<\/strong>: Secure HTTP\/HTTPS protocols can also be used to fetch and install firmware files from a cloud server.<\/li>\n
          • CoAP (Constrained Application Protocol)<\/strong>: In resource-constrained environments, CoAP can be a lightweight alternative for IoT devices to receive updates over low-bandwidth networks.<\/li>\n<\/ul>\n<\/li>\n
          • \n
            Example of Firmware Update Payload<\/strong>:<\/p>\n<\/li>\n<\/ol>\n
            {\n\\\"device_id\\\"<\/span>: \\\"LM123456\\\"<\/span>,\n\\\"update_type\\\"<\/span>: \\\"firmware\\\"<\/span>,\n\\\"version\\\"<\/span>: \\\"v2.0.1\\\"<\/span>,\n\\\"url\\\"<\/span>: \\\"https:\/\/server.com\/firmware\/LMT_v2.0.1.bin\\\"<\/span>,\n\\\"checksum\\\"<\/span>: \\\"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\\\"<\/span>,\n\\\"signature\\\"<\/span>: \\\"MIIBIjANBgkqhkiG9w0BAQEA7ENwFz5H8AyYmHoLBffZuFbKNF<\/span>\\\"\n}<\/pre>\n
            \n
            Example MQTT Code<\/strong><\/h3>\n
            import<\/span> paho.mqtt.client as<\/span> mqtt\n\n# Config. broker MQTT\nBROKER = \\\"mqtt.example.com\\\"<\/span>\nPORT = 1883<\/span>\nTOPIC = \\\"levelmeter\/data\\\"<\/span>\nCLIENT_ID = \\\"LevelMeterClient\\\"<\/span>\n\n# Callback to receive messages\ndef<\/span> on_message<\/span>(client, userdata, message):\nprint<\/span>(f\\\"Messaggio ricevuto: {message.payload.decode()} su {message.topic}<\/span><\/span>\\\")\n\n# Creation client MQTT\nclient = mqtt.Client(CLIENT_ID)\nclient.on_message = on_message\n\n# Connection to broker\nclient.connect(BROKER, PORT)\n\n# Subscribe to the topic\nclient.subscribe(TOPIC)\n\n# Pubblication of a message\npayload = \\'{\\\"temperature\\\": 22.5, \\\"motion\\\": true}<\/span>\\'\nclient.publish(TOPIC, payload)\n\n# Set the loop to receive messages\n\nclient.loop_forever()<\/pre>\n
            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