When the app was not to connect to internet value of the store locally after internet connect value will pass to the database in ionic 4
You can use Several Approaches for this.
1). LocalStorage // localStorage.setItem()
2). Secure LocalStorage // Check This Storage Plugin
3). SQLlite // Check This SQLite plugin
Use Network Plugin (Network Plugin) to detect connection state and save your values in storage you are using.
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I have an issue on firebase; the listener is connected to realtime database with personal hotspot and gets updates from database correctly, but when the hotspoter changes the network quality from 3G to LTE (or another, doesn't matter), the listener starts to not get updates from realtime database anymore. How can I detect this issue?
The Firebase SDK uses various mechanism to detect whether the socket it uses to communicate with the server is still active, but unfortunately these are not always reliable on all (especially) mobile providers.
You could enable debug logging to see what the SDK is going during those 10 minutes, or you could detect the network switch yourself and call goOffline()/goOnline in quick succession so that the SDK creates a new connection.
I'm looking for a way to managing and controlling IoT devices without the (constant) need for a remote server to be part in it and with a PWA instead of a native application on the managing device. The resulting goal is an IoT device that keeps working when a product eventually goes obsolete (no more server running/allocated) and having an application that has PWA benefits like always up-to-date, easy to replicated and cheaply hosted on something like S3.
As an example, let's say I have one or more IoT devices of different classes like an ESP8266 and a Raspberry Pi for instance. Just as with any new IoT device I want to add it to the network and from there on manage its state from an app. The app in this case is a PWA instead of full blown native app.
1) Traditionally, in the initial setup a native app would scan for wifi networks, connecting automatically to one that has the right name. Using PWA's we are limited to just the "state" of the network. So users would have to manually switch to the network of the newly connected IoT device. This is okay.
2) Next up, the user would need to enter his/her wifi credentials. There might be methods to set this up automatically using a native app, but I don't believe this is the case on a PWA. This, also, is okay.
3) The device then restarts, tries to connect to the network set up in (2). If set up correctly it should get its IP using DHCP. And now things get difficult. I want to 'discover' that network from my PWA. There used to be a way to retrieve the IP from a device using the WebRTC API. but that since has changed to show an obfuscated mdns that resolves to localhost. The ip leak would have allowed for a browser based network scan, but that is no longer possible. I always hoped that Android would default to using a users router as a DNS server, but that is not the case. The result is that simply using an mDNS isn't an option either. I do not want user having to check their router, install an app like fing or do anything else that disrupts the flow from a UX perspective.
Step (3) needs to run every time the app starts so you'd want something reliable. Scanning for devices isn't possible using a PWA, so I need to find another method. I was thinking of something like the way Docker containers can find each other in between networks (see etcd for example), using a predefined key that is shared during installation. The problem with this, is that it requires a remote server to store the IPs attached to that key. I don't want that.
Ideas on how to solve this are very much appreciated! I want to be able to offer a solution that would work even when WAN is out. That being said, I am aware that a connection to a remote server is needed if the end user would want to enable any voice assistant or wants to control a device from WAN.
I am working on an application where i need to upload the data to the server for that i need to check the network connection(wifi/3G) if network is not there it will store somewhere till the network available one network find it automatically upload to the server.I don't have any concept to work on this type of situation..Can anyone tell me how to work ...
Use the Reachability framework to detect the connection type. Wrap it to some background loop to check and you're done.
I am new to phonegap - blackberry. I am using Apache ANT, BBWP. I want to connect the database. I refer http://docs.phonegap.com/phonegap_storage_storage.md.html but i cant understand fully. Can any one send me step by step to connect database and its operations. I have some more doubts, How to access access phone music player, and how to read read phone memory / SD card.
Thanks in advance.
As far as I can see, this storage tutorial is about creating your own SQLLite like database. To connect to an existing database on a server, web services with JSON would be a way.
http://supportforums.blackberry.com/t5/Web-and-WebWorks-Development/How-quot-I-quot-would-call-a-web-service-from-a-WebWorks-App/td-p/519745/highlight/false
We have an application which would involve HTTP live streaming. As per the documentation, I can encode my streams and provide the encryption key url (if the key is stored on remote server) in the index file (m3u8).
I want to know if it is possible to store the key locally on the ipad and refer to it locally somehow in the index file. Is it possible to have a local server running on the ipad and provide a localhost url in index files? If so, would the server be bundled with the app build?
Thanks,
Hetal
cocoahttpserver is a HTTP Server on top of ASIHTTPRequest
I haven't done streaming with it, but the homepage says
Asynchronous networking using standard Cocoa sockets/streams