Create Access point in Wireless Temperature Sensor

How to create the access point of Xbee device especially used in the wireless temperature sensor which is useful in monitoring the readings of temperature in corridors of chemical industries where reactor vessels are working for around 7 hours before the one-hour interval.

I am using more than 6 wireless temperature sensor and need to create the wireless mesh network and receive all the readings of the sensor on the gateway modem which is connected to Raspberry Pi.

Any suggestions which help me to create the wireless local mesh network will be a great help.

wireless temperature sensor -