What is the best way to do mass OTA DFU updates for nrf51 and nrf52

[KhuntetaP]

Batch DFU, OTA

[redtide]

We have a lot of nRF52 based products without the JTAG connection, and would like to do a batch update.  We can do OTA updates serially by pairing.  I was wondering if it was possible to do multiple devices simultaneously?

[bjorn-spockeli]

What are  you using as a central; smartphone, PC or a nRF52 based device?