Replicating behaviour of a device with CC1100 transmitter (868MHz)

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i have wireless thermostat central heating system i'd replace arduino+tranceiver.

the manual existing device says uses 868mhz data transmission: http://www.honeywelluk.com/products/systems/wireless-enabled/sundial-rf2-pack-2/

i opened device , pleased see @ atmega329v , identified other chip - texus instruments c1100 tranceiver. (see attached image)

it looks c1100 has been superseded c1101, i've read seem compatible.

my question is: how go capturing transmissions (for later analysis/replay)? presumably simplified having same hardware, rather unknown protocol on same freqency. i've used nrf24l01 modules before , know have different channels / addresses / packet size , structure -  how approach task?

quote
and identified other chip - texus instruments
probably fake.


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