Re: [Hamlib-developer] Python API
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Re: [Hamlib-developer] Python API
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From: Dave B. <g8k...@go...> - 2025-03-30 12:32:38
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Not sure, but you don't need rigctld, to use rigctl. At least not in my
limited experience, only using hamlib on Linux.
I'll have a play...
73.
Dave
On Sun, 30 Mar 2025, 13:19 Adrian, <vk...@gm...> wrote:
> Isn't rigctl a rigctld client ? It works for me that way..
> On 30/3/25 21:27, Dave Baxter via Hamlib-developer wrote:
>
> Steve.
>
> If you've already got "rigctld" open as a daemon in the background, you do
> not need to issue "rigctl" commands, just open a TCP socket to the daemon,
> and issue commands, and receive status replies via that route.
>
> rigctld and rigctl are different animals.
>
> You can have also more than one rigctld running, listening on different
> TCP/IP ports, for different radio's.
>
> As Erik wrote, they can even be on a different machine, so long as the
> address/port is accessible from "your" machine, the radio and it's local
> computer (even a Pi) could be the other side of the planet if needed.
>
> Python is very network friendly in that way, and it works very well too.
> "localhost:port" is your friend...
>
> This crude code below, is what I used a while ago to get the old FT-736r
> to appear as a readable radio, to keep gpredict happy back in the hamlib
> 3.3 days. No longer needed with hamlib 4.x
> ------------------------------
>
> import socket
>
> def Main():
>
> # Local temporary string storage.
> subfreq = "435000000"
> mainfreq = "145000000"
>
> # GPredict side host:port
> # Well away from any default Hamlib port.
> gphost = 'localhost'
> gpport = 50000
>
> # HamLib side host:port
> # Well away from any default Hamlib port.
> hlhost = 'localhost'
> hlport = 50736
>
> # Create a Server socket for GPredict to connect to as a client.
> gpSocket = socket.socket()
> gpSocket.bind((gphost,gpport))
> gpSocket.listen(3)
> print ("FT-736 Helper listening on port " + str(gpport))
>
> # Create a Client socket, to connect to the HamLib server.
> # NOTE! rigctld MUST be started before this script is run!
> # Like this...
>
> # $ rigctld -m110 -r /dev/ttyUSB4 -s 4800 -T localhost -t 50736
> # (post HamLib 4.x use -m1010 for the model number.)
>
> while True:
> gpconn, gpaddr = gpSocket.accept()
> # print ("Connection from: " + str(gpaddr).rstrip())
>
> # The Hamlib backend will automatically have done this, but it
> # will be needed if we turn CAT off, when Gpredict "Disengages"
> # and we later "Engage" the radio.
> # Not needed for Hamlib 3.3 or later, it does the right thing
> # by default.
>
> # hlcmd = "w \\0x00\\0x00\\0x00\\0x00\\0x00\n"
> # print ("Sending " + hlcmd)
> # hlSocket.sendall(hlcmd.encode())
>
> # NOTE! If this is used, rigctld "Expects" a reply from the rig,
> # that will never arrive. So there will be a delay of some 2
> seconds
> # or more before it returns to us.
>
> hlSocket = socket.socket()
> hlSocket.connect((hlhost,hlport))
> print ("Linked to rigctld")
>
> while True:
> gpcmd = gpconn.recv(1024).decode()
> if not gpcmd:
> break
> print ("From Gpredict: " + gpcmd.rstrip())
>
> if gpcmd[0] == "F":
> # Set Main frequency: Remember the value.
> mainfreq = (gpcmd[1:]).lstrip()
> # code here to send to Hamlib
> hlSocket.sendall(gpcmd.encode())
> reply = hlSocket.recv(1024).decode()
> # print ("To Gpredict: " + reply.rstrip())
> gpconn.sendall(reply.encode())
>
> elif gpcmd[0] == "I":
> # Set Sub frequency: Remember the value.
> subfreq = (gpcmd[1:]).lstrip()
> # code here to send to Hamlib
> hlSocket.sendall(gpcmd.encode())
> reply = hlSocket.recv(1024).decode()
> # print ("To Gpredict: " + reply.rstrip())
> gpconn.sendall(reply.encode())
>
> elif gpcmd[0] == "f":
> # fake read of the main frequency
> reply = mainfreq + "\n"
> # print ("To Gpredict: " + reply.rstrip())
> gpconn.sendall(reply.encode())
>
> elif gpcmd[0] == "i":
> # fake read of the sub frequency
> reply = subfreq + "\n"
> # print ("To Gpredict: " + reply.rstrip())
> gpconn.sendall(reply.encode())
>
> elif gpcmd[0] == "q":
> print ("Unlinking from rigctld")
> # hlcmd = "w \\0x00\\0x00\\0x00\\0x00\\0x80\n"ri
> # See earlier notes at lines 45 and 55.
> hlSocket.sendall(gpcmd.encode()) # or hlcmd
>
> else:
> hlSocket.sendall(gpcmd.encode())
> reply = hlSocket.recv(1024).decode()
> # print ("To Gpredict: " + reply.rstrip())
> gpconn.sendall(reply.encode())
>
> gpconn.close()
>
>
> if __name__ == '__main__':
> Main()
> ------------------------------
>
> Heck, if I can do it, etc... No need to comment on bad Python practices,
> this was all my own work mistookes included, but it worked very well indeed.
>
> As above, no longer needed for the Hamlib 4.x, the local frequency memory
> is now implemented within the hamlib backend for the 736, and also it keeps
> the rig CAT port open between so long as at least one application itself
> stays connected to that instance of rigctld (if just to avoid the annoying
> beeps from the rig!)
>
> I could never find a reliable way to detect if the needed daemon was
> already running and if not, start it from within Python, though I'm sure it
> can be done, just the doc's are somewhat impenetrable to someone who is not
> a pro snake charmer!.
>
> That code was itself invoked from a bash script that started the daemon,
> started the Python helper tool, and then launched Gpredict.
>
> Killing stuff off in the reverse order, when Gpredict was itself
> exited/ended.
>
> Best of all, it is entirely cross platform, others used it on various
> Windows machines, while I was doing this on Linux.
>
> 73.
>
> Dave G0WBX.
>
>
> On 30/03/2025 08:53, Stephen Pattinson via Hamlib-developer wrote:
>
> Hi Erik,
> Thanks for responding.
> My Python 3 app is starting rigctld effectively in the background using
> the subprocessPopen() mechanism. Then to retrieve parameters from the
> radio, it is running subprocess.Run() which effectively executes "rigctl -m
> 2 f" for example to get the VFO frequency by capturing the response, but
> firing off a windows EXE program every second is pretty awful. I assumed I
> could via the API I assumed was available, open a channel/pipe/whatever and
> effectively do what ever rigctl is doing internally.
> I've looked at the API references and web pages, but they seem
> convulsively C. I see tantalizing references to python bindings (I'm not
> sure what that means) and in the Debian world I see a python3-hamlib
> library, but of course I'm looking for a Windows solution.
> Am I looking for something that doesn't exist Erik?
> 73 Steve
> VK3SPX
>
>
> On 30/03/2025 18:32, Erik Icket wrote:
>
> Hi Steve,
>
> One way to obtain a better segregation between your Python app and the
> rig,
> is to go via the rigctld daemon.
> Once the daemon runs (local or remote), you may open a socket to it and
> issue your commands.
> For example, to know the frequency, just issue a write to socket with
> "f\n"
> contents.
>
> It is not a straight program to rig interface, as you are looking for.
> However, it does not require to launch the rigctl app each time you issue
> a
> command.
>
> g'day !
> Erik
> ON4PB
>
> -----Original Message-----
> From: Stephen Pattinson via Hamlib-developer
> <ham...@li...>
> <ham...@li...>
> Sent: Saturday, 29 March 2025 09:06
> To: ham...@li...
> Subject: [Hamlib-developer] Python API
>
> Hi,
> I have written a Python (3.12.3) to talk to my IC7300 via Hamlib
> (V4.6.2) in a Windows 10 environment, but I'm just issuing "rigctl"
> commands and capturing the response. This works fine, but it's rather
> crude.
> Of course I would like to use the API which I believe is available, but I
> cannot find how to download the necessary additional software or library,
> or
> find the documentation for the Python API.
> I have looked at
> "https://hamlib.sourceforge.net/manuals/4.3/index.html"
> <https://hamlib.sourceforge.net/manuals/4.3/index.html>, but this seems
> exclusively C Ironically, the most pertinent info I retrieved from a
> search
> is from the Google AI (Sigh!) which suggests I need "hamlib-python", but I
> can't find where the AI has scooped up this information.
> If anybody can point me at installation instructions and documentation for
> the API, I would be grateful.
> Thanks/73
> Steve VK3SPX
>
>
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