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Top Forums Programming Arduino Project: iPhone to HM-10 BLE to NB-IoT Shield to NB-IoT Network to Internet to Linux Server Post 303043441 by Neo on Tuesday 28th of January 2020 10:06:10 PM
Old 01-28-2020
In an earlier test of the AIS NB-IoT Arduino shield, I touched on the fact that the AIS 923MHz NB-IoT network tested illustrated "not the best reliability" due to spotty 923MHz cell tower penetration / coverage.

However, on the ocean side of my condo, I have improved this reliability issue a few DB (my RF power meter is not very accurate, sorry) with this antenna:

Arduino Project:  iPhone to HM-10 BLE to NB-IoT Shield to NB-IoT Network to Internet to Linux Server-img_9086jpg


More importantly than potential antenna gain, the 923MHz NB-IoT signal is considerably more reliable after placing the antenna at the window and off my desktop (which is about 3 to 4 meters away from the window).

In addition, I have the Arduino sketch sending the message to a remote Linux server via BLE and the NB-IoT network and will post the code / sketch after I add a mini-app to get some server stats like the server load averages back to the iPhone. Just need to add a few lines of code to my test Python UDP server code and change the sketch to receive the result and display it on the iPhone.

So far, it's pretty simple (after working out the conflict between serial comm pins last yesterday).

More Arduino shield porn Smilie
Arduino Project:  iPhone to HM-10 BLE to NB-IoT Shield to NB-IoT Network to Internet to Linux Server-img_9087jpg
 
Test Your Knowledge in Computers #26
Difficulty: Easy
IPv6 addresses are 256 bits in length.
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SERVICES(5)						     Linux Programmer's Manual						       SERVICES(5)

NAME
services - Internet network services list DESCRIPTION
services is a plain ASCII file providing a mapping between human-friendly textual names for internet services, and their underlying assigned port numbers and protocol types. Every networking program should look into this file to get the port number (and protocol) for its service. The C library routines getservent(3), getservbyname(3), getservbyport(3), setservent(3), and endservent(3) support querying this file from programs. Port numbers are assigned by the IANA (Internet Assigned Numbers Authority), and their current policy is to assign both TCP and UDP proto- cols when assigning a port number. Therefore, most entries will have two entries, even for TCP-only services. Port numbers below 1024 (so-called "low numbered" ports) can be bound to only by root (see bind(2), tcp(7), and udp(7)). This is so clients connecting to low numbered ports can trust that the service running on the port is the standard implementation, and not a rogue service run by a user of the machine. Well-known port numbers specified by the IANA are normally located in this root-only space. The presence of an entry for a service in the services file does not necessarily mean that the service is currently running on the machine. See inetd.conf(5) for the configuration of Internet services offered. Note that not all networking services are started by inetd(8), and so won't appear in inetd.conf(5). In particular, news (NNTP) and mail (SMTP) servers are often initialized from the system boot scripts. The location of the services file is defined by _PATH_SERVICES in <netdb.h>. This is usually set to /etc/services. Each line describes one service, and is of the form: service-name port/protocol [aliases ...] where: service-name is the friendly name the service is known by and looked up under. It is case sensitive. Often, the client program is named after the service-name. port is the port number (in decimal) to use for this service. protocol is the type of protocol to be used. This field should match an entry in the protocols(5) file. Typical values include tcp and udp. aliases is an optional space or tab separated list of other names for this service. Again, the names are case sensitive. Either spaces or tabs may be used to separate the fields. Comments are started by the hash sign (#) and continue until the end of the line. Blank lines are skipped. The service-name should begin in the first column of the file, since leading spaces are not stripped. service-names can be any printable characters excluding space and tab. However, a conservative choice of characters should be used to minimize compatibility problems. E.g., a-z, 0-9, and hyphen (-) would seem a sensible choice. Lines not matching this format should not be present in the file. (Currently, they are silently skipped by getservent(3), getservby- name(3), and getservbyport(3). However, this behavior should not be relied on.) This file might be distributed over a network using a network-wide naming service like Yellow Pages/NIS or BIND/Hesiod. A sample services file might look like this: netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp # message send protocol chargen 19/tcp ttytst source chargen 19/udp ttytst source ftp 21/tcp # 22 - unassigned telnet 23/tcp FILES
/etc/services The Internet network services list <netdb.h> Definition of _PATH_SERVICES SEE ALSO
listen(2), endservent(3), getservbyname(3), getservbyport(3), getservent(3), setservent(3), inetd.conf(5), protocols(5), inetd(8) Assigned Numbers RFC, most recently RFC 1700, (AKA STD0002). COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2010-05-22 SERVICES(5)

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