diff --git a/.arduino-ci.yaml b/.arduino-ci.yaml
new file mode 100644
index 0000000..87bc081
--- /dev/null
+++ b/.arduino-ci.yaml
@@ -0,0 +1,5 @@
+only_boards:
+  - esp8266:esp8266:generic
+  - arduino:renesas_uno:unor4wifi
+library_archives:
+  - Nanopb=https://github.com/nanopb/nanopb/archive/refs/tags/0.4.7.tar.gz=17yaz3sn0fjhxbhjy27hc2960d4h4j4m5xvxqv3psbpi0r8w82hj
\ No newline at end of file
diff --git a/.github/workflows/build_arduino.yml b/.github/workflows/build_arduino.yml
index d850388..73d74df 100644
--- a/.github/workflows/build_arduino.yml
+++ b/.github/workflows/build_arduino.yml
@@ -1,18 +1,19 @@
-name: Build Arduino
-
+name: "CI"
 on:
+  pull_request:
   push:
-    branches: [ master ]
-  workflow_dispatch:
-
 jobs:
-  lint:
-    runs-on: ubuntu-latest
+  ci:
+    runs-on: ubuntu-20.04
     steps:
-      - name: Check out repository
-        uses: actions/checkout@v2
-      - name: Arduino CI
-        uses: Arduino-CI/action@v0.1.6
-        env:
-          EXPECT_EXAMPLES: true
-          EXPECT_UNITTESTS: false
\ No newline at end of file
+    - name: Checkout this repository
+      uses: actions/checkout@v2
+    - name: Cache for arduino-ci
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.arduino15
+        key: ${{ runner.os }}-arduino
+    - name: Install nix
+      uses: cachix/install-nix-action@v12
+    - run: nix-shell -I nixpkgs=channel:nixpkgs-unstable -p arduino-ci --run "arduino-ci"
\ No newline at end of file
diff --git a/.github/workflows/update_protobufs.yml b/.github/workflows/update_protobufs.yml
new file mode 100644
index 0000000..9d1a89c
--- /dev/null
+++ b/.github/workflows/update_protobufs.yml
@@ -0,0 +1,33 @@
+name: "Update protobufs and regenerate classes"
+on: workflow_dispatch
+
+jobs:
+  update-protobufs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: Update submodule
+        run: |
+          git submodule update --remote protobufs
+
+      - name: Download nanopb
+        run: |
+          wget https://jpa.kapsi.fi/nanopb/download/nanopb-0.4.7-linux-x86.tar.gz
+          tar xvzf nanopb-0.4.7-linux-x86.tar.gz
+          mv nanopb-0.4.7-linux-x86 nanopb-0.4.7
+
+      - name: Re-generate protocol buffers
+        run: |
+          ./bin/regen-protos.sh
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          add-paths: |
+            protobufs
+            src/
\ No newline at end of file
diff --git a/examples/SendReceiveClient/SendReceiveClient.ino b/examples/SendReceiveClient/SendReceiveClient.ino
index 983d2c8..f56ac70 100644
--- a/examples/SendReceiveClient/SendReceiveClient.ino
+++ b/examples/SendReceiveClient/SendReceiveClient.ino
@@ -25,8 +25,8 @@
 // A different baud rate to communicate with the Meshtastic device can be specified here
 #define BAUD_RATE 9600
 
-// Send a text message every this many msec
-#define SEND_PERIOD (300 * 1000)
+// Send a text message every this many seconds
+#define SEND_PERIOD 300
 
 uint32_t next_send_time = 0;
 
@@ -89,6 +89,6 @@ void loop() {
 
     mt_send_text("Hello, world!", dest, channel_index);
 
-    next_send_time = now + SEND_PERIOD;
+    next_send_time = now + SEND_PERIOD * 1000;
   }
 }