[Paid Software Announcement and Discussion] epsonix:
Mobile data must be turned on on master

Another issue I see with using AAGateway is that mobile data must be turned on all the time. Normally I do have these turned on, but there are situations when either I have to switch off or I'm out of network coverage. I listen to my Spotify playlist while driving always. I have all songs downloaded on my master mobile phone, and could listen it OK e.g. while traveling by plane no problem. Also Spotify works when I connect master directly through USB (no AAGateway, just Android Auto) without mobile data enabled, but for some reason, while using AAGateway, music stops (and all on car screen just hangs, so I think it is wider problem than just Spotify). I'm not sure it is a problem of AAGateway, or AA Server, but mentioning it I hope that maybe it could be resolved somehow in AAGateway?

As I mentioned, normally I have mobile data enabled all the time (practically unlimitted in my mobile plan for use within my country), but in following cases I have problems with it:

1.I'm driving through underground tunnels in my city everyday - poor network coverage, music playback interrupts sometimes for second or two, probably temporary freeze of AA or AAGateWay due to no mobile data.

2.Last week I was on holidays in French Alps, I was driving through Switzerland. I have more than enough mobile data in EU countries roaming allowed free within my mobile phone plan (like 10GB/month), but that does not cover non EU like Switzerland (which is crazy rate, like ~10EUR/1MB). I would expect that once I have my Spotify playlist downloaded, and also downloaded offline Google maps for region I was driving through, I could use all fine via AAGateWay. Not the case - needed to disconnect slave and connect master directly to the car.

WIth #2 I could live with, as anyway I need my phone charged on long travels, and I do such very rarely, but #1 is everyday pain.

Today I was thinking about not using AAGateway anymore because of #1 (and because other hassles like always need of manual turning on Hotspot manually, high drainage of battery, regular issues so I need to play with USB connection on slave - single toggle to Picture streaming mode). SO, I put additional SIM card with 999GB/month of only mobile data available into "slave", disabled AAGateway, installed AA on it. Setup my car bluetooth to allow only music streaming from "slave" phone, then setup my main/master phone disabling AAGateway and as priority allowed it only for phone calls, phonebook, SMS (but no music streaming). Idea was that for phone calls I would use my main phone via BT, and for Google Maps/Spotify I will use "slave" using just AA. Unfortunatelly when AA is connected, my master does not go through car BT, and from AA I can't have access to any calls/phonebook etc (nonetheless setup like this in the car) - maybe that is limit of just 1 BT connection in my car (Alfa Romeo Giulia 2018), so this way failed, and I'm back on AAGateway.

I would love if development of AAGateway would be alive - I know that author right now does it on his own only, with rather low priority, only in spare time which is rare case (I undestand this well). As other forum member suggested, I wonder if it is any way to open the development to more developers? From my side I can offer only testing, as I'm electronics engineer and can't write apks for mobile phones.

It woudl be really great if AAGateWay was brought much further than it is now. Surely issues mentioned above, need of manual turning on AA Server (after phone reboot or AA Server crash), I would look for solution with hotspot being on "slave" (but without need for root on slave; mainly for comfort and lower master phone battery drainage), sort out apk notification (they are annoying sometimes, and have bugs - shrinked always says Waiting for slave... expanded reports correclty 3 lines with status like Connection established etc (can't remember on top of my head)). There is really demand for such apk, but development needs to go at reasonable progress, otherwise it will die and be eventually replaced by commercial competitor's solutions.