It been a while but Emonhub stopped sending data to Emoncms.org again today.
Here is the relevant emoncmsorg entries from the log immediately before its stopped.
2020-08-20 15:46:35,147 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:46:35,149 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902366.956902,15,36011,241.54,51.25,1738,0,282,0,66482,70783,115987,0,0.99,-0.07,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902376.6664126,15,36012,241.53,51.25,1736,0,281,0,66486,70783,115988,0,0.99,-0.1,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902386.4572845,15,36013,241.51,51.25,1729,0,280,0,66491,70783,115989,0,0.99,-0.1,0.9500000000000001,0,14.5,300,300,300,0,0,-69]]&sentat=1597902395
2020-08-20 15:46:36,804 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:47:06,875 DEBUG emoncmsorg Buffer size: 4
2020-08-20 15:47:06,876 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902396.1279106,15,36014,241.54,51.25,1729,0,280,0,66496,70783,115990,0,0.99,-0.08,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902405.8677235,15,36015,241.55,51.25,1725,0,280,0,66500,70783,115991,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902415.542467,15,36016,241.54,51.26,1720,0,280,0,66505,70783,115991,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902425.3293293,15,36017,241.52,51.26,1717,0,279,0,66510,70783,115992,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-69]]&sentat=1597902426
2020-08-20 15:47:08,809 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:47:38,833 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:47:38,834 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902434.963174,15,36018,241.56,51.26,1711,0,279,0,66514,70783,115993,0,0.99,-0.07,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902444.663245,15,36019,241.56,51.26,1711,0,278,0,66519,70783,115994,0,0.99,-0.08,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902454.4792225,15,36020,241.54,51.26,1706,0,278,0,66523,70783,115994,0,0.99,-0.07,0.9500000000000001,0,14.5,300,300,300,0,0,-68]]&sentat=1597902458
2020-08-20 15:47:40,180 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:48:10,196 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:48:10,198 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902464.1805425,15,36021,241.51,51.27,1701,0,277,0,66528,70783,115995,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902473.848422,15,36022,241.48000000000002,51.26,1699,0,277,0,66533,70783,115996,0,0.99,-0.05,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902483.5306208,15,36023,241.5,51.27,1692,0,277,0,66537,70783,115997,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-68]]&sentat=1597902490
2020-08-20 15:48:11,528 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:48:41,567 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:48:41,569 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902493.233889,15,36024,241.52,51.27,1692,0,276,0,66542,70783,115997,0,0.99,-0.06,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902502.9350703,15,36025,241.51,51.27,1691,0,276,0,66546,70783,115998,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-69],[1597902512.7325082,15,36026,241.53,51.27,1687,0,277,0,66551,70783,115999,0,0.99,-0.06,0.9500000000000001,0,14.5,300,300,300,0,0,-69]]&sentat=1597902521
2020-08-20 15:48:43,203 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:49:13,253 DEBUG emoncmsorg Buffer size: 4
2020-08-20 15:49:13,260 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902522.404152,15,36027,241.52,51.27,1692,0,295,0,66555,70783,116000,0,0.99,-0.07,0.96,0,14.5,300,300,300,0,0,-68],[1597902532.1071267,15,36028,241.53,51.27,1692,0,295,0,66560,70783,116000,0,0.99,-0.11,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902541.7958567,15,36029,241.51,51.27,1690,0,288,0,66565,70783,116001,0,0.99,-0.07,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902551.5710042,15,36030,241.5,51.28,1674,0,274,0,66569,70783,116002,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-69]]&sentat=1597902553
2020-08-20 15:49:14,892 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:49:44,917 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:49:44,918 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902561.236659,15,36031,241.52,51.28,1665,0,273,0,66574,70783,116003,0,0.99,-0.07,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902570.912825,15,36032,241.51,51.28,1664,0,273,0,66578,70783,116003,0,0.99,-0.09,0.9500000000000001,0,14.5,300,300,300,0,0,-68],[1597902580.7069266,15,36033,241.51,51.28,1665,0,273,0,66583,70783,116004,0,0.99,-0.08,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-70]]&sentat=1597902584
2020-08-20 15:49:46,569 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:50:16,619 DEBUG emoncmsorg Buffer size: 3
2020-08-20 15:50:16,625 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902590.380142,15,36034,241.54,51.28,1659,0,273,0,66587,70783,116005,0,0.99,-0.1,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-71],[1597902600.0680645,15,36035,241.54,51.28,1656,0,272,0,66591,70783,116006,0,0.99,-0.1,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68],[1597902609.7724266,15,36036,241.53,51.28,1656,0,272,0,66596,70783,116006,0,0.99,-0.08,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68]]&sentat=1597902616
2020-08-20 15:50:36,475 WARNING emoncmsorg emoncmsorg couldn't send to server: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))
2020-08-20 15:50:36,476 WARNING emoncmsorg send failure: wanted 'ok' but got 'None'
2020-08-20 15:51:06,501 DEBUG emoncmsorg Buffer size: 8
2020-08-20 15:51:06,507 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902590.380142,15,36034,241.54,51.28,1659,0,273,0,66587,70783,116005,0,0.99,-0.1,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-71],[1597902600.0680645,15,36035,241.54,51.28,1656,0,272,0,66591,70783,116006,0,0.99,-0.1,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68],[1597902609.7724266,15,36036,241.53,51.28,1656,0,272,0,66596,70783,116006,0,0.99,-0.08,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68],[1597902619.486673,15,36037,241.51,51.29,1652,0,272,0,66600,70783,116007,0,0.99,-0.07,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-69],[1597902629.1754067,15,36038,241.49,51.29,1648,0,271,0,66605,70783,116008,0,0.99,-0.07,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68],[1597902638.9716423,15,36039,241.5,51.29,1646,0,271,0,66609,70783,116008,0,0.99,-0.1,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68],[1597902648.668804,15,36040,241.48000000000002,51.29,1642,0,270,0,66614,70783,116009,0,0.99,-0.07,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-69],[1597902658.3594198,15,36041,241.5,51.29,1640,0,270,0,66618,70783,116010,0,0.99,-0.07,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-68]]&sentat=1597902666
2020-08-20 15:51:13,682 DEBUG emoncmsorg acknowledged receipt with 'ok' from https://emoncms.org
2020-08-20 15:51:43,687 DEBUG emoncmsorg Buffer size: 4
2020-08-20 15:51:43,688 INFO emoncmsorg sending: https://emoncms.org/input/bulk.json?apikey=E-M-O-N-C-M-S-A-P-I-K-E-Y&data=[[1597902668.0510738,15,36042,241.5,51.29,1638,0,270,0,66623,70783,116011,0,0.99,-0.07,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-69],[1597902677.7453904,15,36043,241.48000000000002,51.300000000000004,1633,0,270,0,66627,70783,116011,0,0.99,-0.09,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-69],[1597902687.44222,15,36044,241.48000000000002,51.300000000000004,1629,0,270,0,66631,70783,116012,0,0.99,-0.08,0.9500000000000001,0,14.620000000000001,300,300,300,0,0,-69],[1597902697.2307494,15,36045,241.57,51.300000000000004,1610,0,206,0,66636,70783,116013,0,0.99,-0.07,0.74,0,14.620000000000001,300,300,300,0,0,-70]]&sentat=1597902703
and thereafter there is no reference to emoncmsorg.
I restarted Emonhub and the posting to emoncms.org recommenced.