Communication system, communication device, communication method and program

A communication method for performing communication between a first communication device and a second communication device connected to said first communication device, comprising:

• transmitting data from the first communication device to the second communication device;
• determining whether or not the second communication device normally receives the data transmitted from the first communication device;
• when the data was not normally received, requesting to transmit re-transmission data;
• in the second communication device, determining whether or not said requested re-transmission data is re-transmitted from said first communication device;
• transmitting re-transmission impossible information to said second communication device from said first communication device in response to the request to transmit re-transmission data;
• and
• determining that it is impossible to re-transmit when said second communication device received said re-transmission impossible information.

A non-transitory computer readable storage medium storing a program which makes a computer execute communication processing in a system, which includes:

• a first communication device and a second communication device connected to said first communication device, said processing comprising:
• a process for transmitting data from the first communication device to the second communication device;
• a process for determining whether or not the second communication device normally receives the data transmitted from the first communication device;
• a process for, when the data is not normally received, requesting to transmit re-transmission data;
• and
• a process for, in the second communication device, determining whether or not said requested re-transmission data is re-transmitted from said first communication device;
• a process for transmitting re-transmission impossible information to said second communication device from said first communication device in response to the request to transmit re-transmission data;
• and
• a process for determining that it is impossible to re-transmit when said second communication device received said re-transmission impossible information.