root@ModbusSlave:~# tcpdump -l -i eth0 -vvX proto 6 | cat tcpdump: listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes 10:44:59.413744 IP (tos 0x0, ttl 64, id 62801, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xf467), seq 1821224488:1821224500, ack 1392058069, win 502, options [nop,nop,TS val 3557578087 ecr 1497500987], length 12 0x0000: 4500 0040 f551 4000 4006 dcd8 c0a8 734e E..@.Q@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae28 52f9 1ed5 ..s..~..l..(R... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5567 ....h.........Ug 0x0030: 5942 0d3b 179b 0000 0006 0a02 0120 0010 YB.;............ 10:44:59.413851 IP (tos 0x0, ttl 64, id 1259, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xef69), seq 1:12, ack 12, win 509, options [nop,nop,TS val 1497502040 ecr 3557578087], length 11 0x0000: 4500 003f 04eb 4000 4006 cd40 c0a8 73ee E..?..@.@..@..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1ed5 6c8d ae34 ..sN...~R...l..4 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1158 ....h.......YB.X 0x0030: d40c 5567 179b 0000 0005 0a02 0200 00 ..Ug........... 10:44:59.414104 IP (tos 0x0, ttl 64, id 62802, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x131a), seq 12, ack 12, win 502, options [nop,nop,TS val 3557578088 ecr 1497502040], length 0 0x0000: 4500 0034 f552 4000 4006 dce3 c0a8 734e E..4.R@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae34 52f9 1ee0 ..s..~..l..4R... 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5568 ....h.........Uh 0x0030: 5942 1158 YB.X 10:44:59.414386 IP (tos 0x0, ttl 64, id 62803, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xefc2), seq 12:24, ack 12, win 502, options [nop,nop,TS val 3557578088 ecr 1497502040], length 12 0x0000: 4500 0040 f553 4000 4006 dcd6 c0a8 734e E..@.S@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae34 52f9 1ee0 ..s..~..l..4R... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5568 ....h.........Uh 0x0030: 5942 1158 179c 0000 0006 0a01 0190 0010 YB.X............ 10:44:59.414719 IP (tos 0x0, ttl 64, id 1260, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xef50), seq 12:23, ack 24, win 509, options [nop,nop,TS val 1497502041 ecr 3557578088], length 11 0x0000: 4500 003f 04ec 4000 4006 cd3f c0a8 73ee E..?..@.@..?..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1ee0 6c8d ae40 ..sN...~R...l..@ 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1159 ....h.......YB.Y 0x0030: d40c 5568 179c 0000 0005 0a01 0200 00 ..Uh........... 10:44:59.415366 IP (tos 0x0, ttl 64, id 62804, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x1302), seq 24, ack 23, win 502, options [nop,nop,TS val 3557578088 ecr 1497502041], length 0 0x0000: 4500 0034 f554 4000 4006 dce1 c0a8 734e E..4.T@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae40 52f9 1eeb ..s..~..l..@R... 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5568 ....h.........Uh 0x0030: 5942 1159 YB.Y 10:44:59.415380 IP (tos 0x0, ttl 64, id 62805, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xf0db), seq 24:36, ack 23, win 502, options [nop,nop,TS val 3557578089 ecr 1497502041], length 12 0x0000: 4500 0040 f555 4000 4006 dcd4 c0a8 734e E..@.U@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae40 52f9 1eeb ..s..~..l..@R... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5569 ....h.........Ui 0x0030: 5942 1159 179d 0000 0006 0a04 0065 0005 YB.Y.........e.. 10:44:59.416098 IP (tos 0x0, ttl 64, id 1261, offset 0, flags [DF], proto TCP (6), length 71) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68c7 (incorrect -> 0xa7ed), seq 23:42, ack 36, win 509, options [nop,nop,TS val 1497502042 ecr 3557578089], length 19 0x0000: 4500 0047 04ed 4000 4006 cd36 c0a8 73ee E..G..@.@..6..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1eeb 6c8d ae4c ..sN...~R...l..L 0x0020: 8018 01fd 68c7 0000 0101 080a 5942 115a ....h.......YB.Z 0x0030: d40c 5569 179d 0000 000d 0a04 0a00 3000 ..Ui..........0. 0x0040: 2035 ea00 0200 03 .5..... 10:44:59.416260 IP (tos 0x0, ttl 64, id 62806, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x12e0), seq 36, ack 42, win 502, options [nop,nop,TS val 3557578090 ecr 1497502042], length 0 0x0000: 4500 0034 f556 4000 4006 dcdf c0a8 734e E..4.V@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae4c 52f9 1efe ..s..~..l..LR... 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 556a ....h.........Uj 0x0030: 5942 115a YB.Z 10:45:00.467731 IP (tos 0x0, ttl 64, id 62807, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xebda), seq 36:48, ack 42, win 502, options [nop,nop,TS val 3557579141 ecr 1497502042], length 12 0x0000: 4500 0040 f557 4000 4006 dcd2 c0a8 734e E..@.W@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae4c 52f9 1efe ..s..~..l..LR... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5985 ....h.........Y. 0x0030: 5942 115a 179e 0000 0006 0a02 0120 0010 YB.Z............ 10:45:00.467841 IP (tos 0x0, ttl 64, id 1262, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xe6dd), seq 42:53, ack 48, win 509, options [nop,nop,TS val 1497503094 ecr 3557579141], length 11 0x0000: 4500 003f 04ee 4000 4006 cd3d c0a8 73ee E..?..@.@..=..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1efe 6c8d ae58 ..sN...~R...l..X 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1576 ....h.......YB.v 0x0030: d40c 5985 179e 0000 0005 0a02 0200 00 ..Y............ 10:45:00.468555 IP (tos 0x0, ttl 64, id 62808, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x0a91), seq 48, ack 53, win 502, options [nop,nop,TS val 3557579142 ecr 1497503094], length 0 0x0000: 4500 0034 f558 4000 4006 dcdd c0a8 734e E..4.X@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae58 52f9 1f09 ..s..~..l..XR... 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5986 ....h.........Y. 0x0030: 5942 1576 YB.v 10:45:00.469339 IP (tos 0x0, ttl 64, id 62809, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xe735), seq 48:60, ack 53, win 502, options [nop,nop,TS val 3557579143 ecr 1497503094], length 12 0x0000: 4500 0040 f559 4000 4006 dcd0 c0a8 734e E..@.Y@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae58 52f9 1f09 ..s..~..l..XR... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5987 ....h.........Y. 0x0030: 5942 1576 179f 0000 0006 0a01 0190 0010 YB.v............ 10:45:00.469437 IP (tos 0x0, ttl 64, id 1263, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xe6c2), seq 53:64, ack 60, win 509, options [nop,nop,TS val 1497503096 ecr 3557579143], length 11 0x0000: 4500 003f 04ef 4000 4006 cd3c c0a8 73ee E..?..@.@..<..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f09 6c8d ae64 ..sN...~R...l..d 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1578 ....h.......YB.x 0x0030: d40c 5987 179f 0000 0005 0a01 0200 00 ..Y............ 10:45:00.469800 IP (tos 0x0, ttl 64, id 62810, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x0a77), seq 60, ack 64, win 502, options [nop,nop,TS val 3557579143 ecr 1497503096], length 0 0x0000: 4500 0034 f55a 4000 4006 dcdb c0a8 734e E..4.Z@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae64 52f9 1f14 ..s..~..l..dR... 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5987 ....h.........Y. 0x0030: 5942 1578 YB.x 10:45:00.469865 IP (tos 0x0, ttl 64, id 62811, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xe84d), seq 60:72, ack 64, win 502, options [nop,nop,TS val 3557579144 ecr 1497503096], length 12 0x0000: 4500 0040 f55b 4000 4006 dcce c0a8 734e E..@.[@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae64 52f9 1f14 ..s..~..l..dR... 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5988 ....h.........Y. 0x0030: 5942 1578 17a0 0000 0006 0a04 0065 0005 YB.x.........e.. 10:45:00.469897 IP (tos 0x0, ttl 64, id 1264, offset 0, flags [DF], proto TCP (6), length 71) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68c7 (incorrect -> 0x9f60), seq 64:83, ack 72, win 509, options [nop,nop,TS val 1497503096 ecr 3557579144], length 19 0x0000: 4500 0047 04f0 4000 4006 cd33 c0a8 73ee E..G..@.@..3..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f14 6c8d ae70 ..sN...~R...l..p 0x0020: 8018 01fd 68c7 0000 0101 080a 5942 1578 ....h.......YB.x 0x0030: d40c 5988 17a0 0000 000d 0a04 0a00 3000 ..Y...........0. 0x0040: 2035 ea00 0200 03 .5..... 10:45:00.469946 IP (tos 0x0, ttl 64, id 62812, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x0a57), seq 72, ack 83, win 502, options [nop,nop,TS val 3557579144 ecr 1497503096], length 0 0x0000: 4500 0034 f55c 4000 4006 dcd9 c0a8 734e E..4.\@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae70 52f9 1f27 ..s..~..l..pR..' 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5988 ....h.........Y. 0x0030: 5942 1578 YB.x 10:45:00.781030 IP (tos 0x0, ttl 128, id 19703, offset 0, flags [DF], proto TCP (6), length 52) CMI.fritz.box.51763 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0xa9df (correct), seq 1180707488:1180707500, ack 4159654815, win 4320, length 12 0x0000: 4500 0034 4cf7 4000 8006 451e c0a8 736f E..4L.@...E...so 0x0010: c0a8 73ee ca33 01f6 4660 2aa0 f7ef 4b9f ..s..3..F`*...K. 0x0020: 5018 10e0 a9df 0000 0000 0000 0006 0a01 P............... 0x0030: 0191 0001 .... 10:45:00.781219 IP (tos 0x0, ttl 64, id 46744, offset 0, flags [DF], proto TCP (6), length 50) ModbusSlave.fritz.box.502 > CMI.fritz.box.51763: Flags [P.], cksum 0x68d3 (incorrect -> 0xee54), seq 1:11, ack 12, win 52468, length 10 0x0000: 4500 0032 b698 4000 4006 1b7f c0a8 73ee E..2..@.@.....s. 0x0010: c0a8 736f 01f6 ca33 f7ef 4b9f 4660 2aac ..so...3..K.F`*. 0x0020: 5018 ccf4 68d3 0000 0000 0000 0004 0a01 P...h........... 0x0030: 0100 .. 10:45:00.781610 IP (tos 0x0, ttl 128, id 19704, offset 0, flags [DF], proto TCP (6), length 40) CMI.fritz.box.51763 > ModbusSlave.fritz.box.502: Flags [.], cksum 0xb576 (correct), seq 12, ack 11, win 4320, length 0 0x0000: 4500 0028 4cf8 4000 8006 4529 c0a8 736f E..(L.@...E)..so 0x0010: c0a8 73ee ca33 01f6 4660 2aac f7ef 4ba9 ..s..3..F`*...K. 0x0020: 5010 10e0 b576 0000 0000 0000 0000 P....v........ 10:45:01.523132 IP (tos 0x0, ttl 64, id 62813, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xe34c), seq 72:84, ack 83, win 502, options [nop,nop,TS val 3557580197 ecr 1497503096], length 12 0x0000: 4500 0040 f55d 4000 4006 dccc c0a8 734e E..@.]@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae70 52f9 1f27 ..s..~..l..pR..' 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5da5 ....h.........]. 0x0030: 5942 1578 17a1 0000 0006 0a02 0120 0010 YB.x............ 10:45:01.523248 IP (tos 0x0, ttl 64, id 1265, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xde4e), seq 83:94, ack 84, win 509, options [nop,nop,TS val 1497504149 ecr 3557580197], length 11 0x0000: 4500 003f 04f1 4000 4006 cd3a c0a8 73ee E..?..@.@..:..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f27 6c8d ae7c ..sN...~R..'l..| 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1995 ....h.......YB.. 0x0030: d40c 5da5 17a1 0000 0005 0a02 0200 00 ..]............ 10:45:01.523364 IP (tos 0x0, ttl 64, id 62814, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x0206), seq 84, ack 94, win 502, options [nop,nop,TS val 3557580197 ecr 1497504149], length 0 0x0000: 4500 0034 f55e 4000 4006 dcd7 c0a8 734e E..4.^@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae7c 52f9 1f32 ..s..~..l..|R..2 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5da5 ....h.........]. 0x0030: 5942 1995 YB.. 10:45:01.523923 IP (tos 0x0, ttl 64, id 62815, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xdea7), seq 84:96, ack 94, win 502, options [nop,nop,TS val 3557580198 ecr 1497504149], length 12 0x0000: 4500 0040 f55f 4000 4006 dcca c0a8 734e E..@._@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae7c 52f9 1f32 ..s..~..l..|R..2 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5da6 ....h.........]. 0x0030: 5942 1995 17a2 0000 0006 0a01 0190 0010 YB.............. 10:45:01.524618 IP (tos 0x0, ttl 64, id 1266, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xde34), seq 94:105, ack 96, win 509, options [nop,nop,TS val 1497504151 ecr 3557580198], length 11 0x0000: 4500 003f 04f2 4000 4006 cd39 c0a8 73ee E..?..@.@..9..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f32 6c8d ae88 ..sN...~R..2l... 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1997 ....h.......YB.. 0x0030: d40c 5da6 17a2 0000 0005 0a01 0200 00 ..]............ 10:45:01.524777 IP (tos 0x0, ttl 64, id 62816, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x01ec), seq 96, ack 105, win 502, options [nop,nop,TS val 3557580198 ecr 1497504151], length 0 0x0000: 4500 0034 f560 4000 4006 dcd5 c0a8 734e E..4.`@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae88 52f9 1f3d ..s..~..l...R..= 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5da6 ....h.........]. 0x0030: 5942 1997 YB.. 10:45:01.525485 IP (tos 0x0, ttl 64, id 62817, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xdfbf), seq 96:108, ack 105, win 502, options [nop,nop,TS val 3557580199 ecr 1497504151], length 12 0x0000: 4500 0040 f561 4000 4006 dcc8 c0a8 734e E..@.a@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae88 52f9 1f3d ..s..~..l...R..= 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 5da7 ....h.........]. 0x0030: 5942 1997 17a3 0000 0006 0a04 0065 0005 YB...........e.. 10:45:01.525546 IP (tos 0x0, ttl 64, id 1267, offset 0, flags [DF], proto TCP (6), length 71) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68c7 (incorrect -> 0x96d1), seq 105:124, ack 108, win 509, options [nop,nop,TS val 1497504152 ecr 3557580199], length 19 0x0000: 4500 0047 04f3 4000 4006 cd30 c0a8 73ee E..G..@.@..0..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f3d 6c8d ae94 ..sN...~R..=l... 0x0020: 8018 01fd 68c7 0000 0101 080a 5942 1998 ....h.......YB.. 0x0030: d40c 5da7 17a3 0000 000d 0a04 0a00 3000 ..]...........0. 0x0040: 2035 ea00 0200 03 .5..... 10:45:01.526081 IP (tos 0x0, ttl 64, id 62818, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0x01ca), seq 108, ack 124, win 502, options [nop,nop,TS val 3557580200 ecr 1497504152], length 0 0x0000: 4500 0034 f562 4000 4006 dcd3 c0a8 734e E..4.b@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae94 52f9 1f50 ..s..~..l...R..P 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 5da8 ....h.........]. 0x0030: 5942 1998 YB.. 10:45:01.781027 IP (tos 0x0, ttl 128, id 19705, offset 0, flags [DF], proto TCP (6), length 52) CMI.fritz.box.51763 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0xa9c7 (correct), seq 12:24, ack 11, win 4320, length 12 0x0000: 4500 0034 4cf9 4000 8006 451c c0a8 736f E..4L.@...E...so 0x0010: c0a8 73ee ca33 01f6 4660 2aac f7ef 4ba9 ..s..3..F`*...K. 0x0020: 5018 10e0 a9c7 0000 0000 0000 0006 0a01 P............... 0x0030: 0193 0001 .... 10:45:01.781182 IP (tos 0x0, ttl 64, id 46745, offset 0, flags [DF], proto TCP (6), length 50) ModbusSlave.fritz.box.502 > CMI.fritz.box.51763: Flags [P.], cksum 0x68d3 (incorrect -> 0xee4a), seq 11:21, ack 24, win 52456, length 10 0x0000: 4500 0032 b699 4000 4006 1b7e c0a8 73ee E..2..@.@..~..s. 0x0010: c0a8 736f 01f6 ca33 f7ef 4ba9 4660 2ab8 ..so...3..K.F`*. 0x0020: 5018 cce8 68d3 0000 0000 0000 0004 0a01 P...h........... 0x0030: 0100 .. 10:45:01.781474 IP (tos 0x0, ttl 128, id 19706, offset 0, flags [DF], proto TCP (6), length 40) CMI.fritz.box.51763 > ModbusSlave.fritz.box.502: Flags [.], cksum 0xb560 (correct), seq 24, ack 21, win 4320, length 0 0x0000: 4500 0028 4cfa 4000 8006 4527 c0a8 736f E..(L.@...E'..so 0x0010: c0a8 73ee ca33 01f6 4660 2ab8 f7ef 4bb3 ..s..3..F`*...K. 0x0020: 5010 10e0 b560 0000 0000 0000 0000 P....`........ 10:45:02.578068 IP (tos 0x0, ttl 64, id 62819, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xdabd), seq 108:120, ack 124, win 502, options [nop,nop,TS val 3557581252 ecr 1497504152], length 12 0x0000: 4500 0040 f563 4000 4006 dcc6 c0a8 734e E..@.c@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d ae94 52f9 1f50 ..s..~..l...R..P 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 61c4 ....h.........a. 0x0030: 5942 1998 17a4 0000 0006 0a02 0120 0010 YB.............. 10:45:02.578185 IP (tos 0x0, ttl 64, id 1268, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xd5c0), seq 124:135, ack 120, win 509, options [nop,nop,TS val 1497505204 ecr 3557581252], length 11 0x0000: 4500 003f 04f4 4000 4006 cd37 c0a8 73ee E..?..@.@..7..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f50 6c8d aea0 ..sN...~R..Pl... 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1db4 ....h.......YB.. 0x0030: d40c 61c4 17a4 0000 0005 0a02 0200 00 ..a............ 10:45:02.578337 IP (tos 0x0, ttl 64, id 62820, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0xf97a), seq 120, ack 135, win 502, options [nop,nop,TS val 3557581252 ecr 1497505204], length 0 0x0000: 4500 0034 f564 4000 4006 dcd1 c0a8 734e E..4.d@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d aea0 52f9 1f5b ..s..~..l...R..[ 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 61c4 ....h.........a. 0x0030: 5942 1db4 YB.. 10:45:02.580026 IP (tos 0x0, ttl 64, id 62821, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xd618), seq 120:132, ack 135, win 502, options [nop,nop,TS val 3557581254 ecr 1497505204], length 12 0x0000: 4500 0040 f565 4000 4006 dcc4 c0a8 734e E..@.e@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d aea0 52f9 1f5b ..s..~..l...R..[ 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 61c6 ....h.........a. 0x0030: 5942 1db4 17a5 0000 0006 0a01 0190 0010 YB.............. 10:45:02.580090 IP (tos 0x0, ttl 64, id 1269, offset 0, flags [DF], proto TCP (6), length 63) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68bf (incorrect -> 0xd5a5), seq 135:146, ack 132, win 509, options [nop,nop,TS val 1497505206 ecr 3557581254], length 11 0x0000: 4500 003f 04f5 4000 4006 cd36 c0a8 73ee E..?..@.@..6..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f5b 6c8d aeac ..sN...~R..[l... 0x0020: 8018 01fd 68bf 0000 0101 080a 5942 1db6 ....h.......YB.. 0x0030: d40c 61c6 17a5 0000 0005 0a01 0200 00 ..a............ 10:45:02.580227 IP (tos 0x0, ttl 64, id 62822, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0xf95f), seq 132, ack 146, win 502, options [nop,nop,TS val 3557581254 ecr 1497505206], length 0 0x0000: 4500 0034 f566 4000 4006 dccf c0a8 734e E..4.f@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d aeac 52f9 1f66 ..s..~..l...R..f 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 61c6 ....h.........a. 0x0030: 5942 1db6 YB.. 10:45:02.580662 IP (tos 0x0, ttl 64, id 62823, offset 0, flags [DF], proto TCP (6), length 64) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [P.], cksum 0x68c0 (incorrect -> 0xd731), seq 132:144, ack 146, win 502, options [nop,nop,TS val 3557581254 ecr 1497505206], length 12 0x0000: 4500 0040 f567 4000 4006 dcc2 c0a8 734e E..@.g@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d aeac 52f9 1f66 ..s..~..l...R..f 0x0020: 8018 01f6 68c0 0000 0101 080a d40c 61c6 ....h.........a. 0x0030: 5942 1db6 17a6 0000 0006 0a04 0065 0005 YB...........e.. 10:45:02.580719 IP (tos 0x0, ttl 64, id 1270, offset 0, flags [DF], proto TCP (6), length 71) ModbusSlave.fritz.box.502 > iobroker1.fritz.box.54910: Flags [P.], cksum 0x68c7 (incorrect -> 0x8e43), seq 146:165, ack 144, win 509, options [nop,nop,TS val 1497505207 ecr 3557581254], length 19 0x0000: 4500 0047 04f6 4000 4006 cd2d c0a8 73ee E..G..@.@..-..s. 0x0010: c0a8 734e 01f6 d67e 52f9 1f66 6c8d aeb8 ..sN...~R..fl... 0x0020: 8018 01fd 68c7 0000 0101 080a 5942 1db7 ....h.......YB.. 0x0030: d40c 61c6 17a6 0000 000d 0a04 0a00 3000 ..a...........0. 0x0040: 2035 ea00 0200 03 .5..... 10:45:02.580818 IP (tos 0x0, ttl 64, id 62824, offset 0, flags [DF], proto TCP (6), length 52) iobroker1.fritz.box.54910 > ModbusSlave.fritz.box.502: Flags [.], cksum 0x68b4 (incorrect -> 0xf93f), seq 144, ack 165, win 502, options [nop,nop,TS val 3557581254 ecr 1497505207], length 0 0x0000: 4500 0034 f568 4000 4006 dccd c0a8 734e E..4.h@.@.....sN 0x0010: c0a8 73ee d67e 01f6 6c8d aeb8 52f9 1f79 ..s..~..l...R..y 0x0020: 8010 01f6 68b4 0000 0101 080a d40c 61c6 ....h.........a. 0x0030: 5942 1db7 YB.. ^C42 packets captured 42 packets received by filter 0 packets dropped by kernel