> > + unsigned int mru; /* Maximum incoming frame payload size */ > > + unsigned int mtu; /* Maximum outgoing frame payload size */ > > I'm used to "payload" referring in networking context to "useful" part of > the frame but MTU/MRU probably includes headers too? Maybe just say > "frame size"? Just frame size is incorrect, as the basic/advanced option mode header and byte stuffing do not count against this number. See 'gsm0_receive' and 'gsm1_receive' and also ch. 5.7.2 of the standard. The outgoing limit is applied in 'gsm_dlci_data_output' and 'gsm_dlci_data_output_framed'. Link: https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516 Best regards, Daniel Starke
