iot

问题 I have seen code for individual enrollment but I can't find any for group enrollment. I need to bulk enroll a thousand devices to Azure IOT Hub and was thinking of group enrollment.Any sample code will be appreciated. 回答1: It should be possible both with group enrollment and bulk individual enrollments. From the samples related to How to manage device enrollments with Azure Device Provisioning Service SDKs: Bulk Individual Enrollments public async Task<List<IndividualEnrollment>>

问题 Would it be possible to do relation in this sense in firestore ? whereby I want to relate a field in collection to another field in another collection Eg: I have 2 different collection - tracking and venue tracking <-- collection 1. document(xyz123) device_unique_identifier = "abcd1234" timestamp = 10/09/2019 10:00 2. document(xyz567) device_unique_identifier = "efgh3456" timestamp = 10/09/2019 11:00 venue <-- collection 1. document(zyx123) name = "room A" device_unique_identifier = "abcd1234

问题 I'm working with HiveMQ Client and I wanted to know if there was a way to get the quality of service (QoS) that a client is subscribing with (in terms of a specific topic or in general)? I would be looking for a method I could invoke on a client like so: Mqtt5BlockingClient subscriber = Mqtt5Client.builder() .identifier(UUID.randomUUID().toString()) // the unique identifier of the MQTT client .serverHost("localhost") .serverPort(1883) .buildBlocking(); subscriber.getQoS("topic") // returns

问题 I'm doing Android Things project. I want to publish a String message to Google Cloud IoT Core, but there are errors shown. I'm using Raspberry Pi 3 with Android Things OS and and programming it using Android Studio. Errors screenshot: This is the whole code: AndroidManifest.xml: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cacaosd.com.sample1"> <!-- PAHO Permissions --> <uses-permission android:name="android.permission

问题 I am using Contiki to create an IoT product involving multiple STM32L152 based nodes and a Linux board. I have one embedded Linux board (based on iMX6) that receives data from nodes, sends to the internet using cellular and 10 nodes that sense the different environmental parameter and deliver to Linux board. Linux board has a coprocessor that running border/edge router code, UART2 lines of that coprocessor is connected to Linux board. I use Contiki tool tunslip6 to create tun0 interface, I am

问题 I'm using esp8266 with the firmware produced with Marcel's NodeMCU custom builds http://frightanic.com/nodemcu-custom-build/ I tested the "dev" branch and the "master". I changed a little bit the " Connect to MQTT Broker " code found here https://github.com/nodemcu/nodemcu-firmware -- init mqtt client with keepalive timer 120sec m = mqtt.Client("clientid", 120, "user", "password") m:on("connect", function(con) print ("connected") end) m:on("offline", function(con) print ("offline") end) -- m

问题 I have created an windows 10 iot core application and i created the app bundle in appx format. That's installing properly in windows 10 machine. But i want to install in IOT core board The package file which i have created like below: ABC_1.0.9.0_AnyCPU_Debug.appxbundle I have created through visual studio 回答1: You can follow this tutorial to create the the appxbundle. Then in the windows iot device portal, select add button to install your app like this: After that, you will see this Dialog：

问题 I'm trying to implement ECC in 6LoWPAN border router. I'm using contiki Wismote motes for all udp_sender.c as sender and the Border router (border_router.c) needs to receive some messages and also reply ECC keys. I have disabled the default server (WITH_WEBSERVER=0) in makefile and enabled debug_print. udp_sender.c sends messages correctly but the border router doesn't receive messages. Nothing executes after PROCESS_YIELD in border_router.c while(1) { PROCESS_YIELD(); **//Nothing executes

问题 This is my i2c sensor: http://www.mindsensors.com/rpi/76-smartdrive-high-current-motor-controller look in pdf in Documents sessions please Based on this google guide https://developer.android.com/things/sdk/pio/pio-cli.html What I need to put in XX ZZ YY UU to run motors in determined speed, direction, duration, etc... e.g.: pio i2c I2C1 0x1B write-reg-buffer 0xXX 0xYY 0xUU 0xZZ As (in this case) I will use writeRegBuffer() on my android things app to run one, two or both motors in determined

问题 I'm using Pimoroni Rainbow-Hat Raspberry pi3 kit. I have loaded android things image on sdcard. I have power cable and ethernet cable connected. I can see Android things boot screen on display but i don't see the IP. When i try to connect with adb connect Android.local it's not working(getting unknow host). I tried the ethernet cable from pi3 ethernet port to laptop , i can see the lan ip when i do ipconfig /all but when i try adb connect <-ip-:5555, still connection gets refused. but am able