3 ms·
GDB is just a branding for their own flavor of what they're selling which is Iridium Burst, which also appear to run on the 9602/9603 SBD modules, so... maybe I
by kotaKat 3y ago
GDB is just a branding for their own flavor of what they're selling which is Iridium Burst, which also appear to run on the 9602/9603 SBD modules, so... maybe Iridium Burst is just spicier Iridium SBD?
https://www.iridium.com/services/iridium-burst/ https://www.iridium.com/services/iridium-burst/
- lxgr 3y agoSBD is bidirectional unicast (and mandatorily so; as you say, SBD can't transmit to devices before they initiate a mailbox exchange, with the exception of a "message waiting" indicator. Iridium Burst seems to be multicast-capable, and optionally bidirectional or unidirectional, so "spicier SBD" makes sense! But their paging service was definitely unidirectional and unicast. Here's an old talk on decoding the signal, if you're curious: https://media.ccc.de/v/31c3_-_6236_-_en_-_saal_1_-_201412281645_-_iridium_pager_hacking_-_sec_-_schneider https://media.ccc.de/v/31c3_-_6236_-_en_-_saal_1_-_201412281...
- kotaKat 3y agoYep -- actually contributed an NAL Shout Nano so they had additional protocol decoding on top of SBD ;)