Add Status LED for diagnostics of device

[klew]

No description provided.

[ermaya]

SuplaDevice.cpp

you should add something here because now when the network is disconnected the status remains "17" Registered and ready.

1046 if (!Supla::Network::IsReady()) {
1047 wait_for_iterate = millis() + 500;
1048 return;

for example:

1046 if (!Supla::Network::IsReady()) {
1047 wait_for_iterate = millis() + 500;
1048 status(STATUS_DISCONNECTED, "Not connected to Network");
1049 return;

[klew]

I added new status. You can check it.
On my side this problem was not visible, because it always changed status to "STATUS_DISCONNECTED" before "IsReady" method returned "false". In fact it always took few seconds before this method started to return false, so it always executed those lines first:
if (!Supla::Network::Connected()) {
status(STATUS_DISCONNECTED, "Not connected");

Here is the change: 35f26f0