Ignore "No Checksum with line number" errors as they trigger a resend just as well as e.g. "No Line Number with checksum" (quick check of the Marlin source seems to confirm this).
Ignore "No Checksum with line number" errors as they trigger a resend just as well as e.g. "No Line Number with checksum" (quick check of the Marlin source seems to confirm this).

Should hopefully help with #5 and #9 -- will not reduce the communication errors (that's most probably not the comm stacks fault but rather a noise issue or something) but will lead to a more error resilient behaviour. Please test (I can't reproduce the issue(s)).

beeverycreative/BEEweb,mrbeam/OctoPrint,uuv/OctoPrint,chriskoz/OctoPrint,Skeen/OctoPrint,foosel/OctoPrint,alex1818/OctoPrint,shaggythesheep/OctoPrint,eddieparker/OctoPrint,aerickson/OctoPrint,chriskoz/OctoPrint,SeveQ/OctoPrint,Voxel8/OctoPrint,MoonshineSG/OctoPrint,senttech/OctoPrint,CapnBry/OctoPrint,mrbeam/OctoPrint,punkkeks/OctoPrint,dragondgold/OctoPrint,Skeen/OctoPrint,foosel/OctoPrint,masterhou/OctoPrint,AstroPrint/AstroBox,3dprintcanalhouse/octoprint2,mayoff/OctoPrint,abinashk-inf/AstroBox,eliasbakken/OctoPrint,nickverschoor/OctoPrint,mayoff/OctoPrint,mcanes/OctoPrint,MoonshineSG/OctoPrint,CapnBry/OctoPrint,chriskoz/OctoPrint,Voxel8/OctoPrint,beeverycreative/BEEweb,Mikk36/OctoPrint,CapnBry/OctoPrint,C-o-r-E/OctoPrint,nicanor-romero/OctoPrint,madhuni/AstroBox,AstroPrint/AstroBox,SeveQ/OctoPrint,hudbrog/OctoPrint,C-o-r-E/OctoPrint,3dprintcanalhouse/octoprint2,MolarAmbiguity/OctoPrint,abinashk-inf/AstroBox,AstroPrint/AstroBox,ymilord/OctoPrint-MrBeam,javivi001/OctoPrint,madhuni/AstroBox,EZ3-India/EZ-Remote,abinashk-inf/AstroBox,foosel/OctoPrint,DanLipsitt/OctoPrint,beeverycreative/BEEweb,Javierma/OctoPrint-TFG,aerickson/OctoPrint,madhuni/AstroBox,skieast/OctoPrint,leductan-nguyen/RaionPi,bicephale/OctoPrint,shohei/Octoprint,skieast/OctoPrint,hudbrog/OctoPrint,markwal/OctoPrint,javivi001/OctoPrint,JackGavin13/octoprint-test-not-finished,Salandora/OctoPrint,EZ3-India/EZ-Remote,MolarAmbiguity/OctoPrint,d42/octoprint-fork,shohei/Octoprint,masterhou/OctoPrint,jneves/OctoPrint,alex1818/OctoPrint,dansantee/OctoPrint,Jaesin/OctoPrint,javivi001/OctoPrint,punkkeks/OctoPrint,leductan-nguyen/RaionPi,JackGavin13/octoprint-test-not-finished,senttech/OctoPrint,3dprintcanalhouse/octoprint1,dragondgold/OctoPrint,markwal/OctoPrint,Catrodigious/OctoPrint-TAM,hudbrog/OctoPrint,dragondgold/OctoPrint,dansantee/OctoPrint,alex1818/OctoPrint,sstocker46/OctoPrint,uuv/OctoPrint,ryanneufeld/OctoPrint,eliasbakken/OctoPrint,mayoff/OctoPrint,3dprintcanalhouse/octoprint1,jneves/OctoPrint,leductan-nguyen/RaionPi,eddieparker/OctoPrint,Jaesin/OctoPrint,skieast/OctoPrint,mcanes/OctoPrint,Salandora/OctoPrint,nicanor-romero/OctoPrint,chriskoz/OctoPrint,bicephale/OctoPrint,ymilord/OctoPrint-MrBeam,shohei/Octoprint,EZ3-India/EZ-Remote,masterhou/OctoPrint,foosel/OctoPrint,nickverschoor/OctoPrint,CapnBry/OctoPrint,Voxel8/OctoPrint,mcanes/OctoPrint,senttech/OctoPrint,leductan-nguyen/RaionPi,Skeen/OctoPrint,Mikk36/OctoPrint,bicephale/OctoPrint,Javierma/OctoPrint-TFG,MolarAmbiguity/OctoPrint,JackGavin13/octoprint-test-not-finished,uuv/OctoPrint,bicephale/OctoPrint,nickverschoor/OctoPrint,Catrodigious/OctoPrint-TAM,spapadim/OctoPrint,Jaesin/OctoPrint,nicanor-romero/OctoPrint,shaggythesheep/OctoPrint,ErikDeBruijn/OctoPrint,ymilord/OctoPrint-MrBeam,Catrodigious/OctoPrint-TAM,ryanneufeld/OctoPrint,ErikDeBruijn/OctoPrint,sstocker46/OctoPrint,rurkowce/octoprint-fork,MoonshineSG/OctoPrint,rurkowce/octoprint-fork,MaxOLydian/OctoPrint,Jaesin/OctoPrint,sstocker46/OctoPrint,MaxOLydian/OctoPrint,MaxOLydian/OctoPrint,aerickson/OctoPrint,markwal/OctoPrint,dansantee/OctoPrint,punkkeks/OctoPrint,shohei/Octoprint,spapadim/OctoPrint,mrbeam/OctoPrint,shaggythesheep/OctoPrint,SeveQ/OctoPrint,JackGavin13/octoprint-test-not-finished,eddieparker/OctoPrint,ryanneufeld/OctoPrint,ymilord/OctoPrint-MrBeam,ymilord/OctoPrint-MrBeam,senttech/OctoPrint,eliasbakken/OctoPrint,abinashk-inf/AstroBox,Salandora/OctoPrint,beeverycreative/BEEweb,Mikk36/OctoPrint,madhuni/AstroBox,d42/octoprint-fork,ryanneufeld/OctoPrint,jneves/OctoPrint,shohei/Octoprint,Salandora/OctoPrint,MoonshineSG/OctoPrint,nickverschoor/OctoPrint,DanLipsitt/OctoPrint,Javierma/OctoPrint-TFG,ErikDeBruijn/OctoPrint,EZ3-India/EZ-Remote,spapadim/OctoPrint,Javierma/OctoPrint-TFG,C-o-r-E/OctoPrint