This is CodeZoo NB-IoT's schematic, development guide, lecture materials.
$ TPB23_CORE_BOARD.pdf
Xbee type NB-IoT communication module. Used in combination with a shield or hat.
$ TPB23_Shield.pdf
Used in combination with the Arduino board or ARM Mbed board.
Temperature, humidity, 6-axis sensor and user LED included.
$ TPB23_Hat.pdf
Used in Raspberry pi board.
Temperature, humidity, 6-axis sensor and user LED included.
$ TPB23 AT NB-IoT Command Set RD2007B001-CAFF03.pdf
TPB23 AT Command Guide manual
$ TPB23 Module Hardware Guide_A.pdf
TPB23 Hardware Design Guide
$ NB-IoT Various lecture materials