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The CY5677 is not obsoleted from what I can see:
It is only listed as obsolete on digikey. It could be they are wrong on their part status.
Both digikey and mouser are not selling it anymore:
Is there any alternatives?
Or is cypress planing to stop further supporting / developing of cysmart / BLE?
The CY5670 is similar; From what I can tell, it looks like they pulled both off of the shelves however
Not sure what a replacement BLE sniffer would be; The CY5672 contains the CY5670, but also has extra RDK parts, so the price will be higher ;(
There is however, the mobile app version CySmart – Mobile App | Cypress Semiconductor which will allow the same usage, but with a phone app instead. This would mean that you can use your phone as the CY5677 replacement if needed?