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tell the car about the Wi-Fi join before TCP

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Seb3thehacker committed 2026-10-09 15:30:41 -07:00
1 parent fb4b0e2914
commit 6f9fc061e3
1 file changed
+13 -7
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gearslip/src/main/java/app/seb3thehacker/gearslip/wireless/WirelessLink.kt
+13 -7
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@@ -34,8 +34,9 @@ import java.util.UUID
* <- VersionRequest -> VersionResponse
* <- StartRequest {ip, port} -> InfoRequest
* <- InfoResponse {ssid, password, bssid, security}
* 3. Join the car's Wi-Fi as a local-only network, so the phone's internet stays on mobile data.
* -> StartResponse {status} -> ConnectionStatus {status}
* 3. Join the car's Wi-Fi as a local-only network, so the phone's internet stays on mobile data,
* and say so over Bluetooth before connecting:
* -> StartResponse {phone ip, status} -> ConnectionStatus {status}
* 4. TCP to {ip, port} over that network, and hand the socket to [onConnected].
*
* The Bluetooth channel stays open for the whole drive: the car pings over it, and some cars end
@@ -65,7 +66,7 @@ object WirelessLink {
private const val MSG_PING = 8
private const val MSG_PONG = 9
private const val TCP_TRIES = 5
private const val TCP_TRIES = 12 // about a minute: a car's projection listener can start well after its Wi-Fi
private const val WIFI_WAIT_MS = 60_000
/** Set by the activity: starts a session on the car's socket. */
@@ -248,6 +249,15 @@ object WirelessLink {
val callback = object : ConnectivityManager.NetworkCallback() {
override fun onAvailable(net: Network) {
log.i("Wi-Fi: joined \"$ssid\"")
// Real phones report the join over Bluetooth before opening TCP, and some cars
// only start listening once they hear it.
val phoneIp = manager.getLinkProperties(net)?.linkAddresses
?.firstOrNull { it.address is java.net.Inet4Address }?.address?.hostAddress.orEmpty()
runCatching {
send(output, MSG_START_RESPONSE, Protobuf.stringField(1, phoneIp) + Protobuf.varintField(3, STATUS_SUCCESS))
send(output, MSG_CONNECTION_STATUS, Protobuf.varintField(1, STATUS_SUCCESS))
log.i("-> StartResponse (phone at $phoneIp), ConnectionStatus: success")
}.onFailure { log.w("Bluetooth: couldn't report the Wi-Fi join (${it.message})") }
Thread({ connectTcp(output, name, net, ip, port) }, "gearslip-wireless-tcp").start()
}
@@ -280,10 +290,6 @@ object WirelessLink {
socket.connect(InetSocketAddress(ip, port), 5_000)
tcp = socket
log.i("TCP: connected to $ip:$port (try ${attempt + 1})")
runCatching {
send(output, MSG_START_RESPONSE, Protobuf.varintField(3, STATUS_SUCCESS))
send(output, MSG_CONNECTION_STATUS, Protobuf.varintField(1, STATUS_SUCCESS))
}
val start = onConnected
if (start == null) {
log.w("TCP: connected, but nothing is waiting for the socket")