diff --git a/Makefile.include b/Makefile.include
index 7534453b53..f9299f7a5f 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -895,6 +895,10 @@ debug: $(DEBUGDEPS)
 	$(call check_cmd,$(DEBUGGER),Debug program)
 	$(DEBUGGER) $(DEBUGGER_FLAGS)
 
+debug-client:
+	$(call check_cmd,$(DEBUGCLIENT),Debug client program)
+	$(DEBUGCLIENT) $(DEBUGCLIENT_FLAGS)
+
 debug-server:
 	$(call check_cmd,$(DEBUGSERVER),Debug server program)
 	$(DEBUGSERVER) $(DEBUGSERVER_FLAGS)
diff --git a/dist/tools/buildsystem_sanity_check/check.sh b/dist/tools/buildsystem_sanity_check/check.sh
index 4884e5fb5b..9ee0eb0eee 100755
--- a/dist/tools/buildsystem_sanity_check/check.sh
+++ b/dist/tools/buildsystem_sanity_check/check.sh
@@ -107,6 +107,7 @@ UNEXPORTED_VARIABLES+=('FLASHER' 'FFLAGS')
 UNEXPORTED_VARIABLES+=('RESET' 'RESETFLAGS')
 UNEXPORTED_VARIABLES+=('DEBUGGER' 'DEBUGGER_FLAGS')
 UNEXPORTED_VARIABLES+=('DEBUGSERVER' 'DEBUGSERVER_FLAGS')
+UNEXPORTED_VARIABLES+=('DEBUGCLIENT' 'DEBUGCLIENT_FLAGS')
 UNEXPORTED_VARIABLES+=('PREFLASHER' 'PREFFLAGS' 'FLASHDEPS')
 UNEXPORTED_VARIABLES+=('OPENOCD_DEBUG_ADAPTER' 'DEBUG_ADAPTER_ID')
 UNEXPORTED_VARIABLES+=('PROGRAMMER_SERIAL')
diff --git a/dist/tools/openocd/openocd.sh b/dist/tools/openocd/openocd.sh
index 91b0bf554e..062874e410 100755
--- a/dist/tools/openocd/openocd.sh
+++ b/dist/tools/openocd/openocd.sh
@@ -50,6 +50,11 @@
 #               TELNET_PORT:    port opened for telnet connections
 #               DBG:            debugger client command, default: 'gdb -q'
 #               TUI:            if TUI!=null, the -tui option will be used
+# debug-client: debug-client <elffile>
+#               connects to a running debug-server
+#               GDB_PORT:       port opened for GDB connections
+#               DBG:            debugger client command, default: 'gdb -q'
+#               TUI:            if TUI!=null, the -tui option will be used
 #
 # debugr:       debug <elfile>
 #               debug given file on the target but flash it first directly
@@ -349,6 +354,21 @@ do_flash() {
     echo 'Done flashing'
 }
 
+do_debugclient() {
+    ELFFILE=$1
+    test_elffile
+    # Export to be able to access these from the sh -c command lines, may be
+    # useful when using a frontend for GDB
+    export ELFFILE
+    export GDB
+    export GDB_PORT
+    export DBG_FLAGS
+    export DBG_DEFAULT_FLAGS
+    export DBG_EXTRA_FLAGS
+    # Start the debugger and connect to the GDB server
+    sh -c "${DBG} ${DBG_FLAGS} ${ELFFILE}"
+}
+
 do_debug() {
     ELFFILE=$1
     test_config
@@ -380,16 +400,7 @@ do_debug() {
             ${OPENOCD_DBG_START_CMD} \
             -l /dev/null & \
             echo \$! > $OCD_PIDFILE" &
-    # Export to be able to access these from the sh -c command lines, may be
-    # useful when using a frontend for GDB
-    export ELFFILE
-    export GDB
-    export GDB_PORT
-    export DBG_FLAGS
-    export DBG_DEFAULT_FLAGS
-    export DBG_EXTRA_FLAGS
-    # Start the debugger and connect to the GDB server
-    sh -c "${DBG} ${DBG_FLAGS} ${ELFFILE}"
+    do_debugclient ${ELFFILE}
 }
 
 do_debugserver() {
@@ -490,6 +501,10 @@ case "${ACTION}" in
     echo "### Starting Debugging ###"
     do_debug "$@"
     ;;
+  debug-client)
+    echo "### Attaching to GDB Server ###"
+    do_debugclient "$@"
+    ;;
   debug-server)
     echo "### Starting GDB Server ###"
     do_debugserver
diff --git a/drivers/sx127x/sx127x_getset.c b/drivers/sx127x/sx127x_getset.c
index feba720ec0..a365f61bca 100644
--- a/drivers/sx127x/sx127x_getset.c
+++ b/drivers/sx127x/sx127x_getset.c
@@ -117,9 +117,10 @@ void sx127x_set_syncword(sx127x_t *dev, uint8_t syncword)
 
 uint32_t sx127x_get_channel(const sx127x_t *dev)
 {
-    return (((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16) |
-            (sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8) |
-            (sx127x_reg_read(dev, SX127X_REG_FRFLSB))) * LORA_FREQUENCY_RESOLUTION_DEFAULT;
+    uint32_t raw = ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16)
+                 | ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8)
+                 | ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFLSB));
+    return (uint64_t)raw * LORA_FREQUENCY_RESOLUTION_NANOHERTZ_DEFAULT / 1000000000U;
 }
 
 void sx127x_set_channel(sx127x_t *dev, uint32_t channel)
@@ -129,7 +130,7 @@ void sx127x_set_channel(sx127x_t *dev, uint32_t channel)
     /* Save current operating mode */
     dev->settings.channel = channel;
 
-    channel = (uint32_t)((double)channel / (double)LORA_FREQUENCY_RESOLUTION_DEFAULT);
+    channel = (uint64_t)channel * 1000000000U / LORA_FREQUENCY_RESOLUTION_NANOHERTZ_DEFAULT;
 
     /* Write frequency settings into chip */
     sx127x_reg_write(dev, SX127X_REG_FRFMSB, (uint8_t)((channel >> 16) & 0xFF));
diff --git a/drivers/sx127x/sx127x_internal.c b/drivers/sx127x/sx127x_internal.c
index d3b86b40ae..0aa45c1f8d 100644
--- a/drivers/sx127x/sx127x_internal.c
+++ b/drivers/sx127x/sx127x_internal.c
@@ -120,11 +120,10 @@ void sx1276_rx_chain_calibration(sx127x_t *dev)
 
     /* Save context */
     reg_pa_config_init_val = sx127x_reg_read(dev, SX127X_REG_PACONFIG);
-    initial_freq = (double)(((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16)
-                            | ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8)
-                            | ((uint32_t)sx127x_reg_read(dev,
-                                                         SX127X_REG_FRFLSB))) *
-                   (double)LORA_FREQUENCY_RESOLUTION_DEFAULT;
+    initial_freq = ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16)
+                 | ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8)
+                 | ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFLSB));
+    initial_freq = (uint64_t)initial_freq * LORA_FREQUENCY_RESOLUTION_NANOHERTZ_DEFAULT / 1000000000U;
 
     /* Cut the PA just in case, RFO output, power = -1 dBm */
     sx127x_reg_write(dev, SX127X_REG_PACONFIG, 0x00);
diff --git a/makefiles/info.inc.mk b/makefiles/info.inc.mk
index f6a4619a30..922ded24ac 100644
--- a/makefiles/info.inc.mk
+++ b/makefiles/info.inc.mk
@@ -119,6 +119,9 @@ info-build:
 	@echo 'DEBUGSERVER:       $(DEBUGSERVER)'
 	@echo 'DEBUGSERVER_FLAGS: $(DEBUGSERVER_FLAGS)'
 	@echo ''
+	@echo 'DEBUGCLIENT:       $(DEBUGCLIENT)'
+	@echo 'DEBUGCLIENT_FLAGS: $(DEBUGCLIENT_FLAGS)'
+	@echo ''
 	@echo 'RESET:       $(RESET)'
 	@echo 'RESET_FLAGS: $(RESET_FLAGS)'
 	@echo ''
diff --git a/makefiles/tools/openocd.inc.mk b/makefiles/tools/openocd.inc.mk
index b5d3e36244..4a7a3aa8bc 100644
--- a/makefiles/tools/openocd.inc.mk
+++ b/makefiles/tools/openocd.inc.mk
@@ -1,12 +1,14 @@
 FLASHER ?= $(RIOTTOOLS)/openocd/openocd.sh
 DEBUGGER ?= $(RIOTTOOLS)/openocd/openocd.sh
 DEBUGSERVER ?= $(RIOTTOOLS)/openocd/openocd.sh
+DEBUGCLIENT ?= $(RIOTTOOLS)/openocd/openocd.sh
 RESET ?= $(RIOTTOOLS)/openocd/openocd.sh
 
 FLASHFILE ?= $(ELFFILE)
 FFLAGS ?= flash $(FLASHFILE)
 DEBUGGER_FLAGS ?= debug $(DEBUG_ELFFILE)
 DEBUGSERVER_FLAGS ?= debug-server
+DEBUGCLIENT_FLAGS ?= debug-client $(DEBUG_ELFFILE)
 RESET_FLAGS ?= reset
 
 ifneq (,$(OPENOCD_DEBUG_ADAPTER))
@@ -44,7 +46,7 @@ ifneq (,$(OPENOCD_CMD_RESET_HALT))
   $(call target-export-variables,flash-only,OPENOCD_CMD_RESET_HALT)
 endif
 
-OPENOCD_DEBUG_TARGETS = debug debugr debug-server
+OPENOCD_DEBUG_TARGETS = debug debugr debug-server debug-client
 
 ifneq (,$(OPENOCD_DBG_EXTRA_CMD))
   # Export OPENOCD_DBG_EXTRA_CMD only to the flash/flash-only target
diff --git a/makefiles/vars.inc.mk b/makefiles/vars.inc.mk
index eec39e761a..9c35946e8f 100644
--- a/makefiles/vars.inc.mk
+++ b/makefiles/vars.inc.mk
@@ -110,6 +110,8 @@ export HEXFILE               # The 'intel hex' stripped result of the compilatio
 # DEBUGGER_FLAGS             # The parameters to supply to DEBUGGER.
 # DEBUGSERVER                # The command to call on "make debug-server", usually a script starting the GDB server.
 # DEBUGSERVER_FLAGS          # The parameters to supply to DEBUGSERVER.
+# DEBUGCLIENT                # The command to call on "make debug-client", usually a script starting the GDB client.
+# DEBUGCLIENT_FLAGS          # The parameters to supply to DEBUGCLIENT.
 # DEVELHELP                  # Set to 1 to spend ROM, RAM and CPU time for help during development (e.g. enable asserts())
 # RESET                      # The command to call on "make reset", this command resets/reboots the target.
 # RESET_FLAGS                # The parameters to supply to RESET.
diff --git a/sys/include/net/lora.h b/sys/include/net/lora.h
index be61195db8..24ccce6a60 100644
--- a/sys/include/net/lora.h
+++ b/sys/include/net/lora.h
@@ -35,9 +35,13 @@ extern "C" {
  * @ingroup  config
  * @{
  */
-/** @brief Frequency resolution in Hz */
-#ifndef LORA_FREQUENCY_RESOLUTION_DEFAULT
-#define LORA_FREQUENCY_RESOLUTION_DEFAULT      (61.03515625)
+#ifndef LORA_FREQUENCY_RESOLUTION_NANOHERTZ_DEFAULT
+/**
+ * @brief Frequency resolution in nano Hz
+ *
+ * This is the same as `(32 * 10^15) >> 19`
+ */
+#define LORA_FREQUENCY_RESOLUTION_NANOHERTZ_DEFAULT      61035156250
 #endif
 
 /** @brief Preamble length, same for Tx and Rx