From 150b75b244602c789934f1a5094f33aa7da3c09a Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Tue, 6 Jun 2023 12:10:39 +0200
Subject: DEXTER: Add pacontrol interface

---
 src/output/Dexter.cpp  | 71 +++++++++++++++++++++++++++++++++++++++++++++++++-
 src/output/Dexter.h    | 14 +++++++++-
 src/output/SDRDevice.h |  4 +++
 3 files changed, 87 insertions(+), 2 deletions(-)

(limited to 'src/output')

diff --git a/src/output/Dexter.cpp b/src/output/Dexter.cpp
index c1d8d2f..dd51517 100644
--- a/src/output/Dexter.cpp
+++ b/src/output/Dexter.cpp
@@ -66,9 +66,35 @@ static void fill_time(struct timespec *t)
     }
 }
 
+static void pacontrol_set_targetpower(zmq::socket_t& sock, int targetpower_dBm)
+{
+    stringstream message_builder;
+    message_builder << "{'PA0' : {'TargetPower': ";
+    message_builder << targetpower_dBm;
+    message_builder << "}}";
+    const auto message = message_builder.str();
+
+    try {
+        const auto r = sock.send(zmq::const_buffer{message.data(), message.size()});
+        if (r.has_value()) {
+            etiLog.level(debug) << "Sent TargetPower=" << targetpower_dBm << " to pacontrol";
+        }
+        else {
+            // zmq_send returned EAGAIN
+            etiLog.level(info) << "Send TargetPower=" << targetpower_dBm << " failed";
+        }
+    }
+    catch (const zmq::error_t& err) {
+        etiLog.level(warn) << "Failed to send TargetPower=" << targetpower_dBm << ": " << err.what();
+    }
+}
+
+
 Dexter::Dexter(SDRDeviceConfig& config) :
     SDRDevice(),
-    m_conf(config)
+    m_conf(config),
+    m_zmq_context(1),
+    m_zmq_sock(m_zmq_context, ZMQ_PUSH)
 {
     etiLog.level(info) << "Dexter:Creating the device";
 
@@ -166,6 +192,41 @@ Dexter::Dexter(SDRDeviceConfig& config) :
 
     m_running = true;
     m_underflow_read_thread = std::thread(&Dexter::underflow_read_process, this);
+
+    m_zmq_sock.setsockopt(ZMQ_SNDTIMEO, 0);
+    if (not m_conf.pacontrol_config_endpoint.empty()) {
+        etiLog.level(debug) << "Creating pacontrol connection to " <<
+            m_conf.pacontrol_config_endpoint;
+        m_zmq_sock.connect(m_conf.pacontrol_config_endpoint.c_str());
+    }
+
+    if (m_conf.pacontrol_targetpower.has_value()) {
+        pacontrol_set_targetpower(m_zmq_sock, *m_conf.pacontrol_targetpower);
+    }
+    else {
+        etiLog.level(warn) << "Config does not defined PA target power";
+    }
+}
+
+static void pacontrol_set_mute(zmq::socket_t& sock, bool mute)
+{
+    string message = "{'PA0' : {'Mute': ";
+    message += (mute ? "True" : "False");
+    message += "}}";
+
+    try {
+        const auto r = sock.send(zmq::const_buffer{message.data(), message.size()});
+        if (r.has_value()) {
+            etiLog.level(debug) << "Sent mute=" << mute << " to pacontrol";
+        }
+        else {
+            // zmq_send returned EAGAIN
+            etiLog.level(info) << "Send mute=" << mute << " failed";
+        }
+    }
+    catch (const zmq::error_t& err) {
+        etiLog.level(warn) << "Failed to send mute=" << mute << ": " << err.what();
+    }
 }
 
 void Dexter::channel_up()
@@ -178,6 +239,10 @@ void Dexter::channel_up()
 
     m_channel_is_up = true;
     etiLog.level(debug) << "DEXTER CHANNEL_UP";
+
+    if (m_zmq_sock.connected()) {
+        pacontrol_set_mute(m_zmq_sock, false);
+    }
 }
 
 void Dexter::channel_down()
@@ -194,6 +259,10 @@ void Dexter::channel_down()
 
     m_channel_is_up = false;
     etiLog.level(debug) << "DEXTER CHANNEL_DOWN";
+
+    if (m_zmq_sock.connected()) {
+        pacontrol_set_mute(m_zmq_sock, true);
+    }
 }
 
 void Dexter::handle_hw_time()
diff --git a/src/output/Dexter.h b/src/output/Dexter.h
index d4f425f..57b9798 100644
--- a/src/output/Dexter.h
+++ b/src/output/Dexter.h
@@ -34,8 +34,14 @@ DESCRIPTION:
 #   include <config.h>
 #endif
 
-#ifdef HAVE_DEXTER
+#if defined(HAVE_DEXTER)
+
+#if !defined(HAVE_ZEROMQ)
+#error "ZeroMQ is mandatory for DEXTER"
+#endif
+
 #include "iio.h"
+#include "zmq.hpp"
 
 #include <string>
 #include <memory>
@@ -120,6 +126,12 @@ class Dexter : public Output::SDRDevice
 
         size_t num_buffers_pushed = 0;
 
+        /* Communication with pacontrol */
+        zmq::context_t m_zmq_context;
+        zmq::socket_t m_zmq_sock;
+        std::string m_pacontrol_endpoint;
+
+        /* Clock State */
         DexterClockState m_clock_state = DexterClockState::Startup;
 
         // Only valid when m_clock_state is not Startup
diff --git a/src/output/SDRDevice.h b/src/output/SDRDevice.h
index 26272be..f84b340 100644
--- a/src/output/SDRDevice.h
+++ b/src/output/SDRDevice.h
@@ -94,6 +94,10 @@ struct SDRDeviceConfig {
     // TCP port on which to serve TX and RX samples for the
     // digital pre distortion learning tool
     uint16_t dpdFeedbackServerPort = 0;
+
+    // DEXTER-specific
+    std::string pacontrol_config_endpoint;
+    std::optional<int> pacontrol_targetpower; // dBm
 };
 
 // Each frame contains one OFDM frame, and its
-- 
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