Quozl's Open Source Quozl works in outback Australia as a firmware and test engineer for a non-profit in Miami that makes laptops for children, and for a telescope as a night assistant and operations technician. When he's not doing that, he writes programs and makes electronic devices, and a few other things. This site is where he publishes the stuff. Each item is given colour-coded categories of interest that may help you to find related items. It was never intended to be a blog, though it may look like one. It also has an RSS feed:

IP over serial on Raspberry Pi Electronics How to set up IP over 3.3V serial between a Raspberry Pi and a host computer running Linux. Prepare the host computer; install the ppp package sudo apt install --yes ppp attach a USB to 3.3V serial adapter to the appropriate GPIO pins, and plug it in to the computer, identify the device, let's assume it appears as /dev/ttyUSB0, run as root pppd nodetach debug noauth nocrtscts local passive /dev/ttyUSB0 115200 lcp-max-configure 10000 (this will repeatedly try to establish a connection, because the LCP configure-request transmission count is set very high). Prepare the Raspberry Pi; install the ppp package sudo apt install --yes ppp add two lines to /etc/rc.local before the exit systemctl stop serial-getty@ttyAMA0.service pppd updetach debug nocrtscts noauth local 10.1.0.1:10.1.0.2 /dev/ttyAMA0 115200 reboot The link will be established, and you can ping or SSH to 10.1.0.1. Use different addresses if required. What it looks like on the host computer using channel 9 Using interface ppp0 Connect: ppp0 <--> /dev/ttyUSB0 sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xa67760f> <pcomp> <accomp>] sent [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xa67760f> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] sent [LCP EchoReq id=0x0 magic=0x25b9b80a] sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x25b9b80a> <pcomp> <accomp>] rcvd [LCP EchoReq id=0x0 magic=0xa67760f] sent [LCP EchoRep id=0x0 magic=0x25b9b80a] rcvd [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] sent [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] rcvd [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 10.1.0.1>] sent [IPCP ConfAck id=0x1 <compress VJ 0f 01> <addr 10.1.0.1>] rcvd [LCP EchoRep id=0x0 magic=0xa67760f] rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] Deflate (15) compression enabled rcvd [IPCP ConfNak id=0x1 <addr 10.1.0.2>] sent [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 10.1.0.2>] rcvd [IPCP ConfAck id=0x2 <compress VJ 0f 01> <addr 10.1.0.2>] local IP address 10.1.0.2 remote IP address 10.1.0.1 Script /etc/ppp/ip-up started (pid 80399) Script /etc/ppp/ip-up finished (pid 80399), status = 0x0 (25 September 2022)

Fund Me Social Hello. Quozl is twiddling his fingers right now. Do you need his help? Quozl does engineering mentoring, product management, software and firmware engineering, code reviews, quality assurance, testing, and teaching. Or would you like to conserve native regrowth forest? Quozl helps manage a few million trees in outback Australia, and the project could do with some funding. Contact quozl at laptop dot org. Thanks! (17 April 2022)

Hector Spectrograph Social Quozl was a telescope night assistant during the recent commissioning of the new Hector multi-integral field instrument and spectrograph. A really busy team of scientists and engineers working together to make research happen. It was fun watching them work. Inputs included tea, coffee, muffins, tim-tams, pavlova, and occasional sleep. Outputs were C++, Python, electronics, and data. Hector - a new massively multiplexed IFS instrument for the Anglo-Australian Telescope, Hector Wiki at Data Central, Telescope instrument page. (9 December 2021)