Communication method, communication device and communication system

A communication method for a communication system having a master-slave communication structure, wherein the communication system includes a master device and a slave device, and wherein the communication method comprises

• the slave device sending a boot report to the master device at power-up to report that the slave device is booting, wherein the boot report includes identity information for the slave device;
• the master device receiving a heartbeat message from the slave device and, if no heartbeat message is received from the slave device for more than a first predetermined time, continuously sending a restore initial state request message to the slave device at a first predetermined time interval to restore the slave device to its initial state until the boot report is received from the slave device again;
• and
• the slave device receives a heartbeat message from the master device and, if no heartbeat message is received from the master device for more than a second predetermined time, continuously sends the boot report to the master device at a second predetermined time interval until a feedback message of successful connection is received from the master device.

A communication device for a slave device in a master-slave communication structure, comprising,

• an initial connection unit for sending a boot report to the master device at power-up to report that the slave device is booting, wherein the boot report includes identity information of the slave device;
• a heartbeat receiving unit for receiving a heartbeat message from the master device;
• and
• a reconnection unit for continuously sending the boot report to the master device at predetermined intervals until a feedback message of successful connection is received from the master device, in the event that the heartbeat message from the master device is not received for more than a predetermined time.