[feat] PocketBook: implement Wi-Fi connection toggling (#4775)

Partially resolves #4747. Will enable switching Wi-Fi on/off in the menu and getting the network status. However, a new Wi-Fi session lasts ~100 seconds and then terminates automatically, apparently, to save the energy. I believe it can be prolonged by some networking activity. Also it is not shut down if the auto suspension is disabled.

frontend/device/pocketbook/device.lua

@@ -36,26 +36,30 @@ local KEY_PREV2  = 0x1c
 local KEY_NEXT2  = 0x1d
 local KEY_COVEROPEN = 0x02
 local KEY_COVERCLOSE = 0x03
+
+local CONNECTING = 1
+local CONNECTED = 2
+local NET_OK = 0
 -- luacheck: pop
 
 ffi.cdef[[
 char *GetSoftwareVersion(void);
 char *GetDeviceModel(void);
+int GetNetState(void);
+int NetConnect(const char *name);
+int NetDisconnect();
 ]]
 
 local function yes() return true end
 local function no() return false end
 
-local function pocketbookEnableWifi(toggle)
-    os.execute("/ebrmain/bin/netagent " .. (toggle == 1 and "connect" or "disconnect"))
-end
 
 local PocketBook = Generic:new{
     model = "PocketBook",
     isPocketBook = yes,
     isInBackGround = false,
     hasOTAUpdates = yes,
-    hasWifiToggle = no,
+    hasWifiToggle = yes,
 }
 
 function PocketBook:init()
@@ -139,12 +143,24 @@ function PocketBook:setDateTime(year, month, day, hour, min, sec)
 end
 
 function PocketBook:initNetworkManager(NetworkMgr)
-    NetworkMgr.turnOnWifi = function()
-        pocketbookEnableWifi(1)
+    function NetworkMgr:turnOnWifi(complete_callback)
+        if inkview.NetConnect(nil) ~= NET_OK then
+            logger.info('NetConnect failed')
+        end
+        if complete_callback then
+            complete_callback()
+        end
+    end
+
+    function NetworkMgr:turnOffWifi(complete_callback)
+        inkview.NetDisconnect()
+        if complete_callback then
+            complete_callback()
+        end
     end
 
-    NetworkMgr.turnOffWifi = function()
-        pocketbookEnableWifi(0)
+    function NetworkMgr:isWifiOn()
+        return inkview.GetNetState() == CONNECTED
     end
 end
 

frontend/ui/network/manager.lua

@@ -98,7 +98,7 @@ function NetworkMgr:beforeWifiAction(callback)
  end
 
 function NetworkMgr:isConnected()
-    if Device:isAndroid() or Device:isCervantes() then
+    if Device:isAndroid() or Device:isCervantes() or Device:isPocketBook() then
         return self:isWifiOn()
     else
         -- `-c1` try only once; `-w2` wait 2 seconds