Communication device capable of establishing a wireless connection with an external device and non-transitory computer-readable recording medium storing computer-readable instructions for a communication device

A communication device comprising:

• a wireless interface;
• a processor;
• and
• a memory storing computer-readable instructions therein, the computer-readable instructions, when executed by the processor, causing the communication device to:
• receive a first specific signal from a first external device via the wireless interface;
• in a case where the first specific signal is received from the first external device, shift an operation state of the communication device from a non-respondent state to a first respondent state, the non-respondent state being a state of not sending an authentication response, and the first respondent state being a state of sending a first authentication response in response to receiving a first authentication request including a first MAC address assigned to the wireless interface as a destination MAC address;
• receive the first authentication request from the first external device via the wireless interface;
• in a case where the first authentication request is received from the first external device after the operation state of the communication device has been shifted to the first respondent state, send the first authentication response to the first external device via the wireless interface;
• and
• in a case where the first authentication response is sent to the first external device, establish a first wireless connection with the first external device via the wireless interface.

A non-transitory computer-readable recording medium storing computer-readable instructions for a communication device,

• wherein the computer-readable instructions, when executed by a processor of the communication device, cause the communication device to:
• receive a first specific signal from a first external device via a wireless interface of the communication device;
• in response to the first specific signal being received from the first external device, cause an output unit of the communication device to output first specific information obtained by using a first public key, wherein the first public key is obtained by the first external device due to the first specific information being outputted, and wherein the first specific information is not outputted before the first specific signal is received from the first external device;
• receive, via the wireless interface, a first authentication request in which the first public key is used from the first external device which has obtained the first public key;
• in a case where the first authentication request is received from the first external device, send a first authentication response to the first external device via the wireless interface;
• and
• in a case where the first authentication response is sent to the first external device, establish a first wireless connection with the first external device via the wireless interface.