A telemetry device for state acquisition for an agricultural working train has a transmission unit for receiving state values from the working train, a tele-unit for wireless transmission of teledata sets to a telemetry server and a processing unit for generating the teledata sets on the basis of the state values that are received. More specifically, the arrangement and method are directed to relieving stresses generated by the weight of the heat sink in the solder balls between the chip carrier package and a printed circuit board through a unique locking connection between the chip carrier package and the printed circuit board. Subsequently, a heat history of secondary heating at a temperature higher than the primary heating temperature is applied to detach and recover the second resin 2 by restoring the shape of the second resin 2, while the first resin 1 adhering to and retained by the separating member 3 is detached by a blade 5 and the like for recovery. The piston defines a small pressure release chamber also in fluid communication with the fluid pressure port. Because a single mode is generated, the aperture of the VCSEL can be enlarged to increase the power that is generated by the VCSEL for that mode. Utilizing mobile inter-mesh communication points facilitates deployment of wireless network access points while enabling the location of access points to follow the concentration of network users.