Network system, constant connection method, communication method, electronic device, constant connection server, application server, and program

A constant connection method comprising:

• a first and a second electronic device performing data communications over a first protocol that enables a constant connection;
• either of the first and second electronic devices determining whether a predetermined condition is satisfied;
• and
• the first and second electronic devices performing data communications over a second protocol when the predetermined condition is satisfied.

An electronic device comprising:

• a communication interface;
• a memory that stores a predetermined condition;
• and
• a processor that performs data communications via the communication interface by using a first protocol that enables a constant connection, and that perform data communications via the communication interface by using a second protocol when the predetermined condition is satisfied.

A network system comprising:

• an electronic device;
• a constant connection server that makes a constant connection with the electronic device;
• and
• an application server that sends data to the electronic device in response to polling from the electronic device,
• wherein the application server pushes a polling instruction to the electronic device via the constant connection server.

A communication method comprising:

• an electronic device opening a constant connection with a constant connection server;
• an application server pushing a polling instruction to the electronic device via the constant connection server;
• the electronic device polling the application server;
• and
• the application server sending data to the electronic device in response to the polling.