GDP

2016-08-05 18:22:11.731784 -0500 mqtt-gdp-gateway: cannot log MQTT message for device/PowerBlade/c098e57000a8 (nrecs 123 => 123): ERROR: 409 conflict [Berkeley:Swarm-GDP:409]

Seeing this for two of the sensors connected to mqtt-gdp-gateway. If I try to restart i get this

2016-08-05 18:23:21.557545 -0500 mqtt-gdp-gateway: gdp_pdu_proc_response(NAK_S_INTERNAL for CMD_APPEND): server error: SEVERE: 500 internal server error [Berkeley:Swarm-GDP:500]

gdp_pdu_proc_resp: no req for incoming response
PDU@0x6cf338:
v=3, ttl=15, rsvd1=0, cmd=224=NAK_S_INTERNAL
dst=Nh8K5M2aX0SC8V_EaKTeFg6Oo3nJxBFp6wn3q90RLKU
src=YmQ5RgUIvr8ZzgaE0PGJFhqIMNXZbm6v3_ExhIloqjI
rid=0, olen=24, chan=0x6cbf80, seqno=0
flags=0xa
datum=0xb6200960, recno=127, dbuf=0xb6202a18, dlen=0
ts=2016-08-05T23:23:21.508035000Z ± 0.500000
sigmdalg=0x3, siglen=78, sig=0xb62009b0
total header=128
GCL@0x6d2610: YmQ5RgUIvr8ZzgaE0PGJFhqIMNXZbm6v3_ExhIloqjI
iomode = 2, refcnt = 2, reqs = (nil), nrecs = 126
flags = 0xa
freefunc = (nil), gclmd = 0x6d0590, digest = 0x6d2f60, x = (nil)
utime = 2016-08-05T23:23:26
gdp_pdu_proc_resp: no req for incoming response
PDU@0x6cf338:
v=3, ttl=15, rsvd1=0, cmd=224=NAK_S_INTERNAL
dst=Nh8K5M2aX0SC8V_EaKTeFg6Oo3nJxBFp6wn3q90RLKU
src=YmQ5RgUIvr8ZzgaE0PGJFhqIMNXZbm6v3_ExhIloqjI
rid=0, olen=24, chan=0x6cbf80, seqno=0
flags=0xa
datum=0xb6200960, recno=127, dbuf=0xb6202a18, dlen=0
ts=2016-08-05T23:23:21.508035000Z ± 0.500000
sigmdalg=0x3, siglen=78, sig=0xb62009b0
total header=128
GCL@0x6d2610: YmQ5RgUIvr8ZzgaE0PGJFhqIMNXZbm6v3_ExhIloqjI
iomode = 2, refcnt = 3, reqs = (nil), nrecs = 126
flags = 0xa
freefunc = (nil), gclmd = 0x6d0590, digest = 0x6d2f60, x = (nil)
utime = 2016-08-05T23:23:41

Any Clues?