fixes

examples/esp32.py

@@ -0,0 +1,36 @@
+"""MicroMesh example for a generic ESP32 development board.
+
+Wiring (cross TX and RX):
+  ESP32 GPIO17 / UART2 TX  -> Meshtastic radio RX
+  ESP32 GPIO16 / UART2 RX  <- Meshtastic radio TX
+  ESP32 GND                --- Meshtastic radio GND
+
+Change the pin numbers when GPIO16 or GPIO17 is unavailable on your board.
+"""
+
+from machine import Pin, UART
+from time import sleep_ms
+
+from micromesh import PortNum, SerialInterface
+
+
+def on_packet(packet):
+    if packet.WhichOneof("payload_variant") != "decoded":
+        return
+    if packet.decoded.portnum == PortNum.TEXT_MESSAGE_APP:
+        print("from !%08x: %s" % (
+            packet.from_, packet.decoded.payload.decode("utf-8", "replace")
+        ))
+
+
+uart = UART(2, baudrate=115200, tx=Pin(17), rx=Pin(16), timeout=0, rxbuf=1024)
+mesh = SerialInterface(uart, on_packet=on_packet, on_log=print)
+mesh.connect()
+
+hello_sent = False
+while True:
+    mesh.poll()
+    if mesh.config_complete and not hello_sent:
+        mesh.sendText("hello from ESP32")
+        hello_sent = True
+    sleep_ms(10)