Communication apparatus and method of controlling the same

A communication method by a communication apparatus, comprising:

• transmitting data to another communication apparatus via a relay apparatus;
• detecting which of a first relay function or a second relay function is being used by the relay apparatus to operate, wherein the first relay function is for causing the relay apparatus to receive the data transmitted from the communication apparatus to the relay apparatus as a communication partner and proxy-transmit the data to the other communication apparatus as a communication partner, and wherein the second relay function is for causing the relay apparatus to relay the data transmitted from the communication apparatus to the other communication apparatus as a communication partner;
• and
• controlling to, in a case where the transmission of the data was interrupted due to disconnection of communication between the relay apparatus and the other communication apparatus and then said communication is restored, resume the transmission of the data after authentication between said communication apparatus and the other communication apparatus when the relay apparatus is operating by the second relay function, and resume the transmission of the data in a state where the authentication is omitted when the relay apparatus is operating by the first relay function.

A non-transitory computer readable storage medium storing a program that causes a computer to execute a communication method comprising:

• transmitting data to another communication apparatus via a relay apparatus;
• detecting which of a first relay function or a second relay function is being used by the relay apparatus to operate, wherein the first relay function is for causing the relay apparatus to receive the data transmitted from the communication apparatus to the relay apparatus as a communication partner and proxy-transmit the data to the other communication apparatus as a communication partner, and wherein the second relay function is for causing the relay apparatus to relay the data transmitted from the communication apparatus to the other communication apparatus as a communication partner;
• and
• controlling to, in a case where the transmission of the data was interrupted due to disconnection of communication between the relay apparatus and the other communication apparatus and then said communication is restored, resume the transmission of the data after authentication between said communication apparatus and the other communication apparatus when the relay apparatus is operating by the second relay function, and resume the transmission of the data in a state where the authentication is omitted when the relay apparatus is operating by the first relay function.