A computing device, comprising: a memory; a communication interface; and a controller; wherein: the communication interface is adapted for communication with an intra network comprising the computing device, an access point and a server, devices in said intra network being locally connected through the access point, said computing device is arranged to produce log information related to its operation, the controller is configured to: store, in the memory, during operation of the computer device, one or more logs that meet a predetermined condition (112, 113), comprising the detection of a predetermined character string set in said one or more logs; detect establishment of a local wireless or wired connection to a mobile router; detect a triggering event to trigger an output of said one or more logs stored in the memory via the mobile router, said triggering event including establishment of the local wireless or wired connection to the mobile router; and upon detection of the triggering event, control the communication interface to transmit said one or more logs stored in the memory to the mobile router, the memory is configured to store a network ID of the mobile router, in response to the communication interface receiving the network ID from the server that has an internet connection and is connected to the computing device through the intra network, and the local wireless connection is established when the computing device is within a communication range of the mobile router and a network ID received from the mobile router matches the network ID stored in the memory. a memory; a communication interface; and a controller; the communication interface is adapted for communication with an intra network comprising the computing device, an access point and a server, devices in said intra network being locally connected through the access point, said computing device is arranged to produce log information related to its operation, the controller is configured to: store, in the memory, during operation of the computer device, one or more logs that meet a predetermined condition (112, 113), comprising the detection of a predetermined character string set in said one or more logs; detect establishment of a local wireless or wired connection to a mobile router; detect a triggering event to trigger an output of said one or more logs stored in the memory via the mobile router, said triggering event including establishment of the local wireless or wired connection to the mobile router; and upon detection of the triggering event, control the communication interface to transmit said one or more logs stored in the memory to the mobile router, the memory is configured to store a network ID of the mobile router, in response to the communication interface receiving the network ID from the server that has an internet connection and is connected to the computing device through the intra network, and the local wireless connection is established when the computing device is within a communication range of the mobile router and a network ID received from the mobile router matches the network ID stored in the memory. store, in the memory, during operation of the computer device, one or more logs that meet a predetermined condition (112, 113), comprising the detection of a predetermined character string set in said one or more logs; detect establishment of a local wireless or wired connection to a mobile router; detect a triggering event to trigger an output of said one or more logs stored in the memory via the mobile router, said triggering event including establishment of the local wireless or wired connection to the mobile router; and upon detection of the triggering event, control the communication interface to transmit said one or more logs stored in the memory to the mobile router, the memory is configured to store a network ID of the mobile router, in response to the communication interface receiving the network ID from the server that has an internet connection and is connected to the computing device through the intra network, and the local wireless connection is established when the computing device is within a communication range of the mobile router and a network ID received from the mobile router matches the network ID stored in the memory.