I have used HMTRP transceiver chips many times. It is a chip the size of nearly half of a letter stamp. I designed a PCB shield to use HMTRP chip instead of XBee modules.
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PCBs can be ordered from PCBWAY:
https://www.pcbway.com/project/shareproject/W118076ASJ4_FD_XBEE_SH_R01___CADCAM.html







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