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Is there any technical limitations that would prevent the OTA update to happen between two BCM20737 modules? I don't see an issue as long as the BLE application is small enough to shelter a copy of the firmware used for the OTA in RAM and the OTA protocol is implemented properly in the module (GATT etc...).
I may have a BCM20737 module in the field that receives over PUART a firmware that would be used to do an OTA update of sensors (peripheral BCM20737 modules). The central would behave in the same manner as the smartphone application that initiate OTA update.