gpsd append: baudrate configuration by systemd service

configure baudrate of serial gnss receiver with gpsctl.

Todo: generic solutions for all hardware
      future-proof: support for more that one gnss module

BugzID: 60330

Signed-off-by: Ramon Moesching <ramon.moesching@netmodule.com>

recipes-connectivity/gpsd/files/gpsbaud.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=GPS baud rate configuration
+Requires=gpsd.socket
+After=gpsd.service
+
+[Service]
+Type=forking
+ExecStart=/usr/bin/gpsctl -s 115200 /dev/ttyS3
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target
+Also=gpsd.socket

recipes-connectivity/gpsd/gpsd_3.17.bbappend

@@ -1,5 +1,6 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
-SRC_URI =+ " \
+SRC_URI_prepend = " \
+            file://gpsbaud.service \
             git://git.netmodule.intranet/nmsw/gpsd.git;protocol=ssh;user=gitea;branch=imu-integration \
             file://60-ublox-neo.rules \ 
             "
@@ -9,7 +10,11 @@ SRC_URI_remove = "${SAVANNAH_GNU_MIRROR}/${BPN}/${BP}.tar.gz"
 SRCREV = "${AUTOREV}"
 S = "${WORKDIR}/git"
 
-SYSTEMD_SERVICE_${PN} += "${BPN}.service"
+SYSTEMD_SERVICE_${PN} += "${BPN}.service \
+                          gpsbaud.service \
+                          "
+
+FILES_${PN} += " gpsbaud.serivce "
 
 TTY_DEVICE = "/dev/ttyS3"
 TTY_DEVICE_imx8-nmhw23 = "/dev/gps0"
@@ -21,6 +26,9 @@ do_install_append () {
     install -d ${D}${sysconfdir}/udev/rules.d
     install -m 0644 ${WORKDIR}/60-ublox-neo.rules ${D}${sysconfdir}/udev/rules.d
 
+    install -d ${D}${systemd_unitdir}/system/
+    install -m 0644 ${WORKDIR}/gpsbaud.service ${D}${systemd_unitdir}/system/
+
 	sed -i 's|DEVICES=""|DEVICES="${TTY_DEVICE}"|g' ${D}/etc/default/gpsd.default
 	sed -i 's|USBAUTO="true"|USBAUTO="${USBAUTO_STATE}"|g' ${D}/etc/default/gpsd.default 
 }